[Bluetooth Function] The decibel meter can connect to your smartphone via the dB Tester app, enabling convenient data transfer and analysis. [Data Logger] The sound meter has the capacity to record up to 20,000 data points, allowing for detailed monitoring and analyse the decibel level. [High Precision] The wireless db meter can accurately measure sound levels ranging from 30 to 130 , with an accuracy of 1.5 dB and a resolution of 0.1 dB [Calibration Mode] The wireless db meter designed with calibration function, with 94dB@1KHz standard [Wide Applications] This Sound Level Meter is compact and funcational design, to carry and widely using for Classroom, Home, Office, Wokshop, and etc. Colour:White & Blue Material:Plastic Package Contents: 1 * Noise Meter 1 * English manual 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.