1,Easy to use, mini digital noise meter, new Bluetooth function, using miniature condenser microphone sensing technology and band‑pass weighting internet design. 2,Easy to install, one‑piece battery back cover, face down the product panel, push open the battery door in the direction of the arrow, lift the battery door and take out the battery, install a new battery according to the polarity prompt. 3,Large LCD screen backlit display, measurement data function sign display, readings are clear at a glance, high definition, backlit display data, can also be used for measurement at night. 4,It is easy to carry, exquisite and compact, with a silicone button for operation, it is not easy to color after friction test, it feels better when used, and it is convenient to hold. 5,Rugged and durable, this microphone is designed with metal holes, and the internal double protection can still protect the sound head intact in the event of an accidental drop, and it is safe to use. Item Type: Sound Level Meter Material: PlasticandSiliconeandMetal Model: VMS-1 Purpose: Noise Measurement Scope of application: Noise measurement in various places such as factories, traffic roads, and home audio Measuring Range: 30-130dB Measurement Accuracy: ±1.5dB Frequency Response: 31.5Hz-8KHz Fast Sampling Rate: 125ms Slow Sampling Rate: 1000ms Resolution: 0.1dB Working Temperature: 0-40 (℃) Working Humidity: ≤80 percent RH Battery: 3xAAA Battery (Not Included) 1 x Sound Level Meter(Battery Not Included) 1 x Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.