State of Assembly: -to-Go Work Temp: -10~50 Celsius wireless protocol: Zigbee 3.0 1. Radio transmission circuit and coding technology to solve signal interference blocking problem 2. Various temperature modes can be adjusted for different scenes 3. Wireless transmission of data signals, remote monitoring of mobile phones 4. Ultra low power consumption and long battery life 5. With low voltage monitoring prompt function 6. send online reports to the 7. Demolition in of professional security 8. Split , high reliability Power: DC3V AAA*2 Battery(not include) colour:white Material:plastic size:61.2X23mm Package Contents: 1*Temperature and humidity sensor(With built-in battery) 1*manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.