Noise Monitor is a tool suitable for checking, monitoring, controlling, testing ambient sound levels, which can be used in noise engineering, product quality control, health prevention and treatment, etc. This LED display decibel meter can be hung on a wall or placed on a table, making it the ideal noise meter for testing sound levels in classrooms, studios, major traffic , factories, construction sites, homes, offices, and more. Product Size:270 x 118 x 35mm 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. Material: ABS colour: Black 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.