Features : Integrated detection with NH3/Temperature/HumidityBuilt-in auto calibration algorithm to enhance sensibility and saveExceeding Alarming with auto detection and auto measuringif people do not like alarm sound ,people can turn it off by pressing the power button 2 times easy operationHistory Records save, 3.5 inch LCD displayNH3 Sensor technolology :Electrochemistry sensorTemperature unit between Celcius and Fahrenheit Switch -24 hours real time monitoring.Detection range: NH3 ( 0-50ppm)Power supply:rechargeable -battery 2000mah includding USB Chargeing cableMaterial:ABSProduct Size:130 x 80 x 30MMColor: As ShownPackage Contents:1X Air Quality Monitor1X USB charging cable1X manualOnly 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.