Integrateddetection with O3/Temperature/Humidity/Built-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 -friendly and easy operation3.5-inch TFT LCDProduct size: 130x80x30 mm (O3) sensor technologyTemperature and humidity sensorsDetection range:(0-500)O3(0.000-5.000ppm/)Power supply mode: built in battery 2000 Ma, including USB charging cableColour:WhiteMaterial:ABSPackage Contents:1 x Detector1 x USB CableOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.