SMATRUL WSD023 WiFi RF Temperature Humidity Sensor LED Display Remote Control Smart APP Alarm Detector 【Remote Monitoring via APP】Monitor your home's temperature and humidity anytime,anywhere using the "Smart Life/Tuya" APP. 【10-in-1 Multi-Device Support】The main unit can connect up to 10 sub-devices,displaying information from different devices every 3 seconds on a large LCD screen for easy monitoring of multiple areas. 【Flexible Sub-Device Installation】Each sub-device comes with a lanyard and adhesive tape for easy hanging or sticking in various monitoring areas like walls,windows,or corners. 【Wireless Control with 100m Coverage】Stable connection between main and sub-devices via RF433 protocol,covering up to 100 meters in open areas,avoiding Bluetooth/WiFi interference. 【Precise Monitoring with Dynamic Updates】Tracks minute temperature and humidity changes with ±0.6°C temperature accuracy and ±6%RH humidity accuracy,updating data every 10 seconds in stable environments. 【Automatic Threshold Alerts】Set upper and lower temperature and humidity limits for automatic APP alerts when conditions are out of range. 【Outdoor Use Capable】High-precision sensors with waterproof and dustproof cover ensure stable operation in various weather conditions. Specifications: APP: Smart Life/Tuya Smart WiFi frequency: 802.11b/g/n 2.4GHz Wireless protocol: 433MHZ Wireless distance: 100M (open area) Input voltage: DC 5V1A Type-C (wifi host); AAA battery*2 DC1.5V (for sub-device) (battery not included) Temperature detection range: -10℃~60℃ Humidity detection range: 0%-99%RH Notes: 1. The host is connected to the mobile app via 2.4G WiFi. The sub-device is directly connected to the host via RF433,and the sub-device cannot be used alone. 2. Each host supports adding up to 10 sub-devices. 3. The temperature and humidity data of up to two sub-devices can be displayed on the screen at the same time. When more than two sub-devices are added,they will be displayed alternately. 4. The default update frequency of this product is temperature ±0.2℃ or humidity ±2%RH,and the data is reported every 10 seconds in a constant temperature environment. 5. The temperature accuracy of this product is ±0.6℃,and the humidity accuracy is ±6%RH. 6. The host is powered by USB,and the sub-device is powered by 2 AAA batteries (not included). Package included: 1 x Host 2 x Thermometer Hygrometer 2 x Lanyard 1 x English Instruction Manual 1 x Charging Cable 2 x Sticker