Fangrui Product Details [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, Easily 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 Er