1、Long Battery Life: The voice recorder is built in high energy polymer lithium battery and a new generation of intelligent power saving system, to achieve long term recording. 2、Improve Efficiency: Recording is performed when a voice is playing and paused when no voice is playing, saving storage space and improving work efficiency. 3、Clear Sound Quality: Built in professional grade powerful noise reduction chip brings you higher fidelity and clearer recorded sound quality and playback. 4、OTG Function and Portable: The round voice recorder supports OTG to connect mobile phones, manage and transfer files. Rope hole design, easy to carry, prevent loss. 5、Premium Material: The mini voice activated recorder is made of high quality metal and glass material, durable, stable performance, long service life. Item Type: Round Voice Recorder Material: Metal + Glass Model: Q39 Color: Black ADPCM Recording: 192Kbit Sampling Rate: 48kHz Play Format: MP3, WMA, WAV Time Stamped: the Recording File Name is Named After the Time Support Fast Advance and Retreat Playback Battery Type: Built-in 160mah Lithium Battery Continuous Recording Time: About 35 Hours Standby Time: About 30 Days 1 x Round Voice Recorder 1 x Data Cable 1 x Headset 1 x English Manual