Product Size:270 x 118 x 35mm Led Screen display Detection method for Noise: Electret Condenser microphone Concentration unit for Noise: dB Measuring range: 1-95dba Color: blackandwhite Material: ABS Temperature unit: Celciu Power supply:rechargeable Li-battery 2000mah,includding USB Chargeing cable Exceeding Alarming with auto detection and auto measuring Screen brightness can be adjusted by hand Large screen ,Wall mount design 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. Package Contents: 1 x Decibel Meter 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.