1Turn the power button on the upper left corner to turn on, adjust to the recording function and start recording. This recorder also supports U disk. 2Our voice recorder is made of metal, the color is black, and it has a built in 260mAh lithium battery. 3The recorder provides a playback recording mode, and the phone recording function allows you to record detailed calls. 4The music formats supported by this recorder are MP3, WMA, FLAC, APE, and the frequency range is 20Hz to 20KHz. 5Supported operating systems includes: for Windows 2000 and above, for Android 4.0 and above, for OS X 10.0 and above. Item Type:DigitalVoiceRecorder Model: N1 Material: Metal Colour: Black Function: Recording, Music Playback Screen: 80x160 Color Screen USB interface: Micro USB Music Format: MP3, WMA, FLAC, APE WAV Format Bit Rate: 512Kbps, 768Kbps, 1024Kbps, 1536Kbps MP3 Format Bit Rate: 32Kbps, 64Kbps, 128Kbps, 192Kbps Frequency Range: 20Hz to 20KHz Signal to Noise Ratio:> 80dB Distortion: 0.05% Battery Type: Built in 260mAh Lithium Battery Supported operating systems for Windows 2000 and above, for Android 4.0 and above, for OS X 10.0 and above 1 x Recording Pen 1 x Earphone 1 x Data Line 1 x Manual