Measuring range: A weighting: 30~130dB, C weighting: 35~130dB Accuracy: +1.5dB (reference sound pressure standard, 94dB@1KHz) Resolution: 0.1dB Frequency response: 31.5Hz~8500Hz Time weighting characteristics: FAST (fast)/SLOW (slow) Sampling rate: fast 8 times/second, slow 1 time/second Internal power supply: 1000mAh 3.7V lithium battery Maximum power-: 8h Working temperature: 0~50 Working humidity: 10~80%RH (Due to different batches, the appearance, color and printed words of the product , which will not affect the use.) Colour:As Shown Material:plastic Package Contents: 1 x Noise meter 1 x Charging cable 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.