Feature 1NOISE REDUCTION: Voice recorder built in noise canceling chip, significantly reduce noise sound waves, stable recording in complex environments. 2EASY TO MANAGE AND CHECK: Mini voice recorder is easy to manage and query. Recording generation is automatically and accurately record the recording time. 3EASY TO USE: U disk voice recorder is easy to use, connect the OTG adapter (not included) with the USB recorder and for Android phone to play sound. 4PLUG AND PLAY: Digital USB voice recorder is plug and play. One key to open the recording state, to meet the recording needs. 5MULTIFUNCTIONAL USE: Mini voice activated recorder is not only a USB flash drive, but also a recorder. Power failure automatically save.Item Type: Mini Voice RecorderMaterial: ABSRecording Format: WAVMusic Format: MP3 WMA WAVBuilt In Polymer Lithium Battery: 120mAhSize: Approx. 21x68x10mm / 0.8x2.7x0.4in .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x MiniVoiceRecorder1 x Instruction BookNotePlease allow some error due to manual measurement.