The Decibel meter is compatible with Android and iOS devices for data recording via the " dB Tester " app , allowing unlimited data transfer and management This portable sound level meter itself can store over 20,000 groups measurement data, and also can be connected to your smartphone to check the real-time recording or export the historical data for fully analysis The measuring range of the decibel meter sound level reader is from 30dB to 130dB .Highly accurate with ± 1.5 dB. Real-time monitoring can give you accurate data on the sound level in the area 4-digit LCD display with a resolution of 0.1 dB. Features with a Large screen makes the sound meter, noise decibel reader easy to use in dark condition. Backlit Alarms, MAX / MIN and data hold function such versatility gives you a great experience of use The wireless db meter equipped with a 1/4inch mount thread for taking sound level measurements in various environments. Making it easy to carry and operate for extended periods without muscle fatigue Colour:As Shown Material:plastic Package Contents: 1 set x decibel meter 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.