this device is equipped with noise cancellation, so you audio recordings wil be clear as possible, and not by the noise in the environment. Voice-activated recording, silent recording,saving memory recording and listening time It can be connected directly to the Android mobile phone system mobile phone through the OTG converter, free from the computer constraints, and directly arrange the recording files on the mobile phone. size:7.2x2.0x0.8cm Material:plastic colour:Black Package Contents: 1 * Voice Recorder(no Memory card) 1 * USB Charging Cable Only the above package content, other products are not included. Note: Light 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.