1. It is a perfect sound level meter for measuring noise levels in home, factories, offices, theaters and audio systems. 2.Digital Sound Level Meter Measuring Range: 30~130dBA; Accuracy: +/- 1.5dB; Resolution: 0.1db; Records Max / Min values all the time. 3.Large LCD Screen of Decibel Tester: has a large backlit screen with LCD display, easy to read the result. 4.Quick Response:Measurements in dBA Frequency; Frequency response: 31.5Hz~8.5KHz. Records Max/Min values all the time. 5. Portable ergonomic design: this sound level meter is a good grip, robust and well finished, can easily slip into a bag and transportable. Power supply: 3*1.5V AAA battery Operating temperature and humidity: 0~40, 10~80% RH Storage temperature and humidity: -10~60c, 0~90% RH Weight: 84.08g (without battery) Dimensions: 50*33*159.5mm Quantity: 1 piece (without battery)