Voice Recorder, 8GB Digital Audio Sound Recorder Dictaphone, Digital Voice Activated Recorder with MP3 Player,High-Sensitivity Dual Microphone, Multifunctional Rechargeable Recorder for Lectures Lossless Sound Quality: Recording via the built-in microphone or line-in with WAV or MP3 format, WAV format REC Bit Rate up to 512kbps (48KHz) provides you real lossless sound quality of recordings. You can monitor recording by simply plug the earphone to listening it while the recording is in progress. Variable Speed Playback and Repeat Function: Playback speed can be adjusted at 1-3x speed faster or slower for playing both recording files and music, perfect for quick review recordings or learn a new music simply press the A-B button to set A-B repeat, you can also set repeat times and repeat interval. Bookmarking &amp; Practical Tools: An Alarm Clock you can set it auto ringing by once/ daily/ work day, A Stopwatch for your basic timing needs. Double Power Source Design: built-in 360mAh Li-ion rechargeable battery provides 28hrs record time and can charge via a computer USB port or a USB 5V/1A(Max) AC adapter, you can also insert one AAA alkaline battery to add 14.5hrs record time that is very useful when urgent needs. Simple and Easy-to-use: Very easy to use even you are a beginner! Package contents: 1x Yulass YR-B9 Recorder, 1x Earphones, 1x USB Cable, 1x Line-in 3.5mm audio cable and 1x Product Manual. 12 months worry-free warranty.