Features:-- The large screen is easier to read the data, and the key is easy to operate.-- Easy to carry, suitable for home, car, office, factory and other other environments.-- 24-hour real-time monitoring, for you and your family's healthy life escort.-- It is suitable for office, family, gym and other occasions , with a wide range of applications.-- Electric quantity display, more convenient to use.-- It has a long service life and can be charged with a USB cable.-- Small and portable, easy to carry, does not take up too much space, can be installed in the house.-- Detectable substances: CO, CO2, HCHO, TVOC, AQI. Specifications:Material: ABSColor: White Detectable substances: CO, CO2, HCHO, TVOC, AQI Display Mode: LED Digital Display Working Voltage: 5V Charging time: about 3 hours Battery capacity: 850mAh (included)Standby time: about 180-240 minutesSize: 63 x 120 x 26mm / 2.48 x 4.72 x 1.02in Package Included: 1 x Detector1 x USB Cable1 x English Manual."