Description: 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:plastic Product Size:270 x 118 x 35mm Led Screen display Detection for Noise : Electret Condenser microphone Concentration unit for Noise : dB Measuring range: 1-95dba Temperature unit : Celciu Power supply:rechargeable -battery 2000mah,includding USB Chargeing cable Exceeding Alarming with auto detection and auto measuring Screen brightness can be adjusted by hand screen ,Wall mount design Colour: Black Package Contents: 1 x Noise Tester 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.