Daily working need be powered by DC5V power adapter. The temperature panel is with built-in rechargeable battery as backup. When the external power is outage, the backup battery can continue to work for some hours.Multi -User Supervision Supported : you can click to share the device to other users;APP: Work with Tuya Smart or Smart Life App; Support 2.4G Wi-Fi/802.11/b/g/n connection, not support 5G;The length of cable with probe reaches to 3 meters (9.8ft), so it is convenience for users to extend it to be somewhere that need be detected temperature. For example, users can put the cable with probe into freezer, pool, sauna room etc. Note: The temperature probe with cable is waterproof, can put into water or extend to be outdoor, but the main panel is not waterproof, please place it indoor.Real-Time Supervision: you can check real time temperature from App anytime anywhere via internet network of 4G or WIFI, and the temperature unit (Fahrenheit or Centigrade ) is switchable.Upper and lower temperature limit alarm: For example : Set the temperature range ( 80.6~91.4 Fahrenheit) . When the temperature in house is within the temperature range , the detector will work normal . If the temperature is lower than 80.6 or higher than 91.4 centigrade degree , the app will push alarm alerts and the Buzzer will sound at the same time .