CO2 Detector CO2 Sensor Analyzer Meter Air Quality Monitor Detector 5000ppm
There are 9 types you can choose, brown 3 in 1, brown 4 in 1, brown 5 in 1, orange 3 in, orange 4 in 1, orange 5 in 1, white 3 in 1, white 4 in 1 and white 5 in 1, among them, 5 in 1 type can connect with for smart phones.