Usage Tips:Large digital LCD. The measuring range is 30 ~ 130dB. The light blinks and the buzzer alarms. The device is used to measure internal and external noise. With mounting hole, can be hung on the wall. Sound and light alarm upper limit alarm value setting: The default alarm value of 130dB after startup, when the measured value exceeds the set alarm value, the instrument will give out "didi" alarm sound, and lock the measured data. The back panel is designed with multiple heat dissipation vents, safe and durable: Ergonomic design. Noise decibel six-box indicator: 30-75dB is displayed in green, 76-130dB is displayed in red. Specifications: Item name: Digital noise meter Brand: TASI Size: 32.3 x 17.3 x 4cm Measuring range: 30 ~ 130dB (dBAccuracy: +1.5 dB (reference sound pressure level,94dB @ 1kHzFrequency response: 31.5Hz ~ 8.5khz Frequency weighting: A Response time: Fast Microphone: 6 mm condenser microphone Power supply: DC 5V 1A Micro-USB Working environment: 0-40 degrees (Fahrenheit to 40 degrees Fahrenheit), 10-80% relative humidity Storage temperature. And humidity: -10~60. 10~70% relative humidity. Colour: black Material: ABS Package Contents: 1 x noise meter 1 x USB power cord 1 x hook 1 x screw 1 x English manual 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.