This product is an environmental quality monitor that detects noise, temperature and humidity. Information technology combines sensors with real-time monitoring of noise, temperature and humidity on monitors.Specification:Material:plasticProduct Size:270 x 118 x 35mmLed Screen displayDetection method for Noise : Electret Condenser microphoneConcentration unit for Noise : dBMeasuring range: 1-95dbaTemperature unit : CelciuPower supply:rechargeable Li-battery 2000mah,includding USB Chargeing cable Exceeding Alarming with auto detection and auto measuringScreen brightness can be adjusted by handLarge screen ,Wall mount designColour: BlackPackage Contents:1 x Noise Tester1 x USB CableOnly 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.