Advantage : WiFi TUYA APP,datas transfer to mobile phones to check CO2 values Wireless Integrated detection with CO2/Temperature/Humidity Auto calibration -Very long working to 12 hours Exceeding Alarming with auto detection and auto measuring MINI CO2 Meter Material:ABS color: White Size:70 x 80 x 35mm WiFi TUYA APP ,Transfer datas to mobiles phons ,support and Common Screen display CO2 Technology : infrared ( NDIR) Temperature unit Celcius CO2 Detection range: 400-5000 ppm CO2 Alarm value : 1000ppm ,support hand Setting CO2 alarm threshold from 800ppm-2000ppm. CO2 Alarm on /off function(if users do not like alarm ,people can turn it off ) supply:rechargeable Li-battery 1600mah includding USB Chargeing cable Alarm sound can be turned off / on by hand operation Package Contents: 1 x quality monitor 1 x usb cable 1 x English manual 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.