{"product_id":"the-quiet-witness-mmwave-presence-sensor","title":"The Quiet Witness | GIRIER 24GHz mmWave Human Presence Sensor for Tuya ZigBee","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp style=\"font-size:16px;line-height:1.75;color:#333;margin:0 0 16px 0;\"\u003eMotion sensors have a design flaw that nobody mentions on the box: they detect movement, not people. Sit still and the room goes dark. The Quiet Witness is built around the correction to that flaw. A 24GHz millimeter-wave radar reads the micro-movement of a human body, including breathing, so presence is presence even when the only thing moving is your chest. A PIR element and a lux sensor sit alongside the radar, and the automation logic can require all three to agree before it decides the room is occupied and dark enough to matter.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.75;color:#333;margin:0 0 16px 0;\"\u003eThe radar is the part that earns the name. It covers up to six meters with a 120 degree field and a beam pattern shaped at 94 degrees in one plane and 114 in the other, mounted on a wall between 1.2 and 2 meters high. Detection delay is adjustable from 10 to 600 seconds, so a hallway can switch in ten seconds while a living room waits ten minutes after the last person stands up. Light sensing runs to 12,000 lux, which is what lets the same rule behave correctly at noon and at midnight without a second device.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;line-height:1.75;color:#333;margin:0 0 16px 0;\"\u003eIt communicates over ZigBee to Tuya Smart or Smart Life, running on a CR2450 cell at roughly 50 microamps average draw so it does not need wiring in the place where a sensor is most useful, high on a wall opposite the door. When presence drops, the sensor can command the rest of the home: lights off, gas valve closed, door locked, alarm armed. That is a different job than switching a lamp. It is the moment your house decides it is empty.\u003c\/p\u003e\n\u003cp style=\"font-size:16px;font-style:italic;color:#555;line-height:1.7;margin-top:20px;\"\u003eA sensor that only sees movement is a switch. One that knows you are still there is an instrument.\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin:24px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-features\"\u003e\n\u003ch3 style=\"font-size:20px;margin:0 0 14px 0;color:#1a1a1a;\"\u003eWhy It Earns Its Place\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003e24GHz millimeter-wave radar\u003c\/strong\u003e detects stationary human presence, including breathing, so lights do not cut out while someone is reading or working at a desk.\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003eThree sensing elements in one body\u003c\/strong\u003e: radar, passive infrared, and a 0 to 12,000 lux light sensor, allowing rules that require both occupancy and darkness.\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003eSix meter range at 120 degrees\u003c\/strong\u003e, with a beam shaped 94 degrees by 114 degrees for wall mounting between 1.2 and 2 meters.\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003eAdjustable 10 to 600 second hold time\u003c\/strong\u003e, so a corridor and a living room can use the same hardware with different patience.\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003eZigBee mesh connection\u003c\/strong\u003e to Tuya Smart and Smart Life, which means it extends the network it joins rather than sitting outside it.\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003eCR2450 battery at roughly 50 microamps average\u003c\/strong\u003e, with no mains wiring required at the mounting point.\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003eIP20 rated for indoor use\u003c\/strong\u003e from minus 10 to 50 degrees Celsius and up to 95 percent humidity.\u003c\/li\u003e\n\u003cli style=\"padding:8px 0;font-size:15px;line-height:1.65;color:#333;\"\u003e✦ \u003cstrong\u003eActs as an automation trigger\u003c\/strong\u003e, not just a light switch: presence states can arm security, close a gas valve, or lock a door when the last person leaves.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003chr style=\"margin:24px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-specs\"\u003e\n\u003ch3 style=\"font-size:20px;margin:0 0 14px 0;color:#1a1a1a;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eBrand:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eGIRIER\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eSensing:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e24GHz mmWave radar plus PIR plus lux sensor\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eProtocol:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eZigBee (2.4 to 2.425GHz)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003ePlatform:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eTuya Smart, Smart Life\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eDetection range:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eUp to 6 m, adjustable\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eDetection angle:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e120 degrees\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003e3dB beam angle:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e94 degrees (XZ plane), 114 degrees (YZ plane)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003ePresence radius:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eMaximum 6 m\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eLight sensing range:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e0 to 12,000 lux\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eHold delay:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e10 to 600 seconds, adjustable\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003ePower:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eCR2450 battery, 2 to 3.3V DC\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eAverage operating current:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e50 microamps or less\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003ePower consumption:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e150 microwatts\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eMounting height:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003e1.2 to 2 m (side mounting)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eOperating temperature:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eminus 10 to plus 50 Celsius\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eOperating humidity:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eUp to 95 percent RH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eIngress protection:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eIP20, indoor use\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #ececec;font-size:15px;line-height:1.6;\"\u003e\n\u003cstrong style=\"color:#1a1a1a;\"\u003eCertification:\u003c\/strong\u003e \u003cspan style=\"color:#4a4a4a;\"\u003eCE, RoHS\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003chr style=\"margin:24px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-applications\"\u003e\n\u003ch3 style=\"font-size:20px;margin:0 0 12px 0;color:#1a1a1a;\"\u003eWhere It Belongs\u003c\/h3\u003e\n\u003cp style=\"font-size:16px;line-height:1.75;color:#333;\"\u003eThis is the sensor you install when a motion detector has already failed you. In a home office the PIR version turns the lights off every time you stop typing, which is why so many people disable their automations. Radar presence fixes that without asking anyone to wave an arm. In a hallway it handles the ten-second case, switching the light on before the door is fully open and off shortly after the last person passes. In a bedroom it holds the light long enough for someone to fall asleep, then releases. Paired with a Tuya hub it becomes the occupancy input for a much larger rule set: heating that drops when the room empties, a security system that arms itself, a gas valve that closes when the kitchen has been clear for thirty minutes. One device, one battery, no wiring, and the house finally knows the difference between an empty room and a still one.\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin:24px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-faq\"\u003e\n\u003ch3 style=\"font-size:20px;margin:0 0 14px 0;color:#1a1a1a;\"\u003eQuestions Buyers Actually Ask\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom:15px;\"\u003e\n\u003cp style=\"margin:0 0 4px 0;font-size:15px;\"\u003e\u003cstrong\u003eQ: Does it detect someone sitting still?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.65;color:#4a4a4a;\"\u003eA: Yes. The millimeter-wave radar reads micro-motion including breathing, which is the specific problem passive infrared sensors cannot solve. A person reading or working at a desk stays detected as long as the hold delay allows.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:15px;\"\u003e\n\u003cp style=\"margin:0 0 4px 0;font-size:15px;\"\u003e\u003cstrong\u003eQ: Do I need a Tuya hub?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.65;color:#4a4a4a;\"\u003eA: Yes. The sensor communicates over ZigBee, which is not a protocol a phone or a Wi-Fi router speaks directly. A Tuya ZigBee gateway is required, and it will also act as the bridge to Smart Life for remote access and automation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:15px;\"\u003e\n\u003cp style=\"margin:0 0 4px 0;font-size:15px;\"\u003e\u003cstrong\u003eQ: How long does the CR2450 battery last?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.65;color:#4a4a4a;\"\u003eA: It depends entirely on hold time and how often the room is triggered, because radar plus PIR draws the most current while active. Average draw is rated at 50 microamps or less, which is what makes months of runtime realistic rather than weeks. Set the hold delay to the shortest period your room actually needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:15px;\"\u003e\n\u003cp style=\"margin:0 0 4px 0;font-size:15px;\"\u003e\u003cstrong\u003eQ: Can it trigger anything other than lights?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.65;color:#4a4a4a;\"\u003eA: Yes. Any Tuya automation can use presence as a condition or a trigger, so it can arm a security system, close a gas valve, lock a smart lock, or drop the thermostat when the room empties.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:15px;\"\u003e\n\u003cp style=\"margin:0 0 4px 0;font-size:15px;\"\u003e\u003cstrong\u003eQ: Will it see through a wall or window?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.65;color:#4a4a4a;\"\u003eA: Millimeter-wave radar does not pass through walls, but it can be affected by glass and thin partitions. Mount it facing the area you want to cover rather than aiming through a window, and expect some sensitivity to large moving objects in the same room.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:15px;\"\u003e\n\u003cp style=\"margin:0 0 4px 0;font-size:15px;\"\u003e\u003cstrong\u003eQ: Where should it be mounted?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.65;color:#4a4a4a;\"\u003eA: Side-mounted on a wall between 1.2 and 2 meters high, facing the space rather than across it, which is what the 94 by 114 degree beam pattern is shaped for. Avoid pointing it directly at a radiator, a curtain in a draught, or a doorway where people only pass through.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:15px;\"\u003e\n\u003cp style=\"margin:0 0 4px 0;font-size:15px;\"\u003e\u003cstrong\u003eQ: Does it work with Home Assistant or Apple Home?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.65;color:#4a4a4a;\"\u003eA: The listing specifies Tuya Smart and Smart Life. Home Assistant users typically integrate it through the Tuya or LocalTuya integration rather than a native ZigBee coordinator, because the device pairs to a Tuya gateway.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003chr style=\"margin:24px 0;border:0;border-top:1px solid #eee;\"\u003e\u003cdiv class=\"product-gallery\" style=\"margin-top:30px;text-align:center;\"\u003e\n\u003cp style=\"margin:12px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S1813c4a94f1f4753975658adaa6bf91f6_65d5a656-f7f4-4819-9cf6-de4fa5533edb.webp?v=1792565625\" alt=\"Product detail\" style=\"max-width:100%;height:auto;border-radius:6px;\" loading=\"lazy\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin:12px 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S8586c81d6d384034a158808f9aa3e5dc3_e5678ece-af10-4dc0-8ef1-de15e71bd488.webp?v=1792565625\" alt=\"Product detail\" 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