Item Type: Mini Voice Recorder Material: ABS Recording Format: WAV Music Format: MP3 WMA WAV Built In Polymer Lithium Battery: 120mAh Size: Approx. 21x68x10mm / 0.8x2.7x0.4in1NOISE 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.Please allow some error due to manual measurement.1 x MiniVoiceRecorder 1 x Instruction Book