4 in 1 Air Quality Detector CO2 Tester LCD Digital Carbon Dioxide Temperature Humidity Detector Alarm Air Quality Monitor NDIR Sensor Description Domestic use multifunctional air quality detector, built-in infrared sensor and fan to real-time monitoring the change of carbon dioxide concentration, temperature, and humidity on its digital high definition screen. Features: 1.Wall-mounted 4-in-1 multifunctional carbon dioxide detector, CO2, tempreture, humidity, CO2 alarm function. 2.When the CO2 concentration up to 1000ppm, the alarm will be louding, can be turned on and off, manual operation. 3.Infrared sensor real-time monitoring carbon dioxide concentration, temperature and humidity. 4.With clock and record function, improve daily life practical. 5.High definition digital display large screen, real time monitoring digital change. 6.Built-in fan to draw in ambient air for more accurate real-time results. 7.Rechargeable large capacity cell, USB cable, lengthen service time. Specifications: Model: DM128B Color: Black Material: ABS Detection Range: CO2 400-5000ppm CO2 Technology : Infrared (NDIR) Carbon Dioxide Exceeds The Alarm Value: 1000ppm Voltage: 5V Cell: 1 * Built-In Lithium Cell, 3.7V 3000mAh (included) Charge Way: USB Cable Packing List: 1 * Carbon Dioxide Detector 1 * USB Cable 1 * English Instruction Book