Features: Unique and practical design, 4mm ultra-thin card size, you can easily put it in your wallet, pocket, convenient to carry to record important voices in life. Supports voice-controlled recording. It will record automatically when there is sound around, and auto-stop when no sound, saving memory and power. With wired headphones, it supports MP3 and recording playback. Supports volume adjustment and track switching. 16GB capacity provides 192 hours of recording. Shutdown to save, simple operation. Built-in 750mAh large capacity polymer lithium battery offers continuous recording for about 150 hours. Specifications: Product Type: Ultra-thin recorder Record Method: Power on to record, power off to save Battery Capacity: 750mAh Charging Time: about 3 hours Battery Life: about 150 hours Memory Capacity: 16GB Recording Time: about 192 hours Sampling Rate: 48KHz Recording Bit Rate: 192KBPS Recording Format: WAV Playback Format: MP3, WMA, WAV Color: Black Item Size: 86*54*4mm/3.38*2.12*0.15in Item Weight: 33g/1.16oz Package Size: 145*90*43mm/5.70*3.54*1.69in Package Weight: 149g/5.25oz Package List: 1 * Voice Recorder 1 * Headphone 1 * Charging Cable 1 * User Manual