Integrateddetection with O3/Temperature/Humidity/ Built-in calibration algorithm to enhance sensibility and save Exceeding Alarming with detection and measuring if people do not like alarm sound ,people can turn it off by pressing the power button 2 -friendly and easy operation 3.5-inch TFT LCD Product size: 130x80x30 mm (O3) sensor technology Temperature and humidity sensors Detection range: (0-500) O3(0.000-5.000ppm/) Power supply mode: built in battery 2000 Ma, including USB charging cable Colour:White Material:ABS Package Contents: 1 x Detector 1 x USB Cable Only the above package content, other products 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.