1、This equipment has been designed to meet the measurement requirement of safety engineers, health, industrial safety offices and sound quality control in various environment, which include factory, office, traffic, family and audio system. 2、With portable, anti-drop, anti-skid, and anti-static, suitable for single hand operating with a comfortable feeling. 3、Featuring large LCD display screen with backlight, cool and modernized, simple to operate and easy to read even in the dark. 4、It will automatic shutdown after no operation for about several minutes to ensure the battery service life and support low battery indication. 5、Designed for sound quality control that measures sound level from 30dBA-130dBA with ±5dB accuracy. 6、The LCD has a light sensor that detects environment lighting conditions, as environment light darkened, light increased. 1 x Instruction1 x Sound Level Meter Condition: 100% Brand NewItem Type: Sound Level MeterMaterial: ABSMeasurement Range: 30~130dBAAccuracy: ± 1.5dBDigit & Resolution: 4 digits& 0.1dBFrequency Response: 31.5Hz~ 8.5KHzFrequency Weighted: A WeightedSampling Frequency: 2 times/sMicrophone: 1/2 inch capacitive microphonePower Supply: 9V x 1 Battery (not included)Size: Approx.57 x 36 x 149mm / 2.2 x 1.5 x 5.9in Weight: Approx. 122g / 4.3oz