Host temperature measurement range: -10C~ 60C Humidity range: 20%-99%. No. 2. Sensor temperature range: -50~70 Humidity range: 20%-99%. No. 3.2 sensor temperature range -50C~70C Humidity range: 20%-99% Host measurement cycle: and No. 2 sensor measurement signal synchronization cycle: 60 seconds Maximum and minimum value memory function The brightness of the light can be adjusted in three levels, and the light can be turned on and off for a long time The host adopts USB charging and built-in 2000mAh lithium battery,and -machine has 2 AAA batteries not included 433 wireless range 100 meters Host size 110X45X85mm Sub machine size 38X20X105mm type:1 to 3 Colour:black Material:ABS Package Contents: 1 x Host 3 x handsets 1 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.