Specifications: Measuring Range: 30~130dBA Accuracy : +/- 1.5dB Frequency Response: 31.5Hz~8KHz Frequency Weighting Features: A Weighting Resolution: 0.1dB Power Source : 3x1.5V AAA Batteries External Dimension:50x33x159.5mm Package includes: 1 x Sound Level Meter (Batteries are not included.) 1 x Manual Instruction.