Features: It can convert ambient sound into electrical signals, process data and displays results on LCD. The product is compact and light weight, convenient to carry. White backlight, LCD digital display, easy to read. Equipped with sponge ball to filter-out unwanted signals. Great tool for monitoring noise levels in hotels, conference halls, home theater, hospitals, and any other noise sensitive environments. Specifications: Color: White Measuring Range: 30 ~ 130dB Accuracy: 1.5dB Resolution: 0.1dB Frequency Range: 31.5HZ ~ 8KHZ Frequency Weighting: A Sampling Frequency: 2 times/sec Digital Display: 4 digits Microphone: 1/2" Condenser microphone Operating Temperature: 0~40C (32 ~ 104 F) Operating Humidity: 10 ~ 80%RH Storage Temperature: -10~60C (14 ~ 140 F) Storage Humidity: 10-70%RH Power Supply: 3 x 1.5V AAA Battery (included) Size: Approx. 14.2 x 5 x 2.5cm / 5.59 x 1.97 x 0.98inch Weight: Approx. 148g Package Included: 1 x Sound Level Meter 3 x 1.5V AAA Battery 1 x Manual