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Specification PST-HW400B Specifications Name Tuya Smart WiFi Ceiling PIR Sensor Model PST-HW400B APP Name Tuya Smart or Smart Life Color White Material ABS Power DC3V LR03*2 Battery USB input DC5V/2A (USB cannot be used with dry battery, only rechargeable battery) WiFi Standards IEEE 802.11 b/n/g 2.4G Hz PIR sensitivity angle 360 degree PIR sensitivity distance 6m Low-battery Detection Support Tuya Smart product Linkage control Support Operation Temp. –10°C to +50°C Humidity 5%--95% non-condensing Installation Ceiling-mounted or Wall Dimension 11.5*6*4.2cm Weight 80g Carton Packing 200PCS per carton: 15.5kg, 34*33*46cm PST-HW400B Package List WiFi PIR Sensor x1 LR03 battery x2 Double-sided tape x1 Installation screws x2 User Manual x1 PST-HW400B Product FAQ Q1: What is this product? A: This is a WiFi Ceiling PIR (Passive Infrared) Motion Detector. It can detect motion and is designed for home or office use. Q2: Which WiFi frequencies does it support? A: It supports 2.4G Hz b/g/n WiFi frequencies. Q3: How do I connect the sensor to my Wi - Fi network? A: Download the Tuya Smart app from the app store. Open the app, create an account if you don't have one. Then, follow the in app instructions to add a new device. Select the Wi - Fi vibration sensor and enter your Wi - Fi password when prompted. Q4: What if my Wi - Fi signal is weak near the sensor's location? A: You may consider using a Wi - Fi extender or a mesh Wi - Fi system to boost the signal. Ensure that the sensor is within a reasonable range of your router for optimal connectivity. Q5: Where should I install this motion detector? A: It is designed to be installed on the ceiling for optimal motion detection coverage. Q6: How does the PIR motion detection work? A: PIR technology detects changes in infrared radiation emitted by moving objects. When an object with a different temperature than the background moves in its detection range, it triggers the detector. Q7: How is the sensor powered? A: The sensor is powered by 2PCS DC1.5V LR03 ultra alkaline AAA batteries and also can be DC5V USB. Q9: How long does the battery last? A: Battery life depends on usage frequency and sensitivity settings. Under normal usage and default settings, the battery can last approximately 6 months if trigger 10 times a day. Q10: What should I do if the sensor doesn't connect to my Wi-Fi network? 1. Check the Basics Power: Ensure the sensor is properly powered. Wi - Fi Signal: Make sure the sensor is within range of your Wi - Fi router. 2. Reset the Sensor 3. Re - add the Device in the App 4. Check Router Settings 5. Update Router and App Firmware Q11: How quickly does it respond to motion? A: It has a fast - response time and can detect motion and send signals within milliseconds. Q12: Does the sensor work with voice assistants? A: It supports Amazon Alexa and Google Assistant. Q13. Does it work in the dark? A: Yes, since it uses infrared technology, it can detect motion regardless of lighting conditions. Q14. Which app should I use to control this device? A: You can use the Tuya - supported app. You can download it from the App Store (for iOS) or Google Play (for Android). Q15. Can I control the device remotely? A: Yes, as long as the device is connected to WiFi and your phone has an internet connection, you can control it remotely through the app. Q16. What functions can I perform through the app? A: You can adjust detection sensitivity, view motion detection history, set up alerts, and manage device settings. Q17. The sensor is constantly sending false alerts. How can I fix this? Lower the sensitivity level in the app. Also, check if there are any sources of constant vibrations near the sensor (e.g., appliances) and relocate it if needed. Q18. The app can't find the sensor. What's wrong? Ensure the sensor is powered on and in pairing mode. Also, check your phone's Bluetooth and Wi - Fi settings, and make sure they are turned on. Q19. Can someone else access my sensor's data? As long as you keep your app account credentials secure, and your Wi - Fi network is protected, it's very unlikely that others can access your sensor's data. Q20. What if the device stops detecting motion? A: Check the detection settings in the app, make sure there are no obstructions in the detection area, and verify that the device is powered on and connected to WiFi.