Professional RecorderThe recorder has perfect recording quality and real stereo experience. Advanced chips and noise reduction allow you to enjoy crystal-clear HD recording and playback in classes, lectures, conferences, presentations, interviews, forensics, and more.LONG TIME RECORDING- The large-capacity rechargeable 4600mAh battery of this recorder can last up to 365 days in standby and 500 hours of continuous recording after each full charge. The passcode lock also makes your recorder a security keeper (set up on your computer).Mini and Easy-to-Use Activation Voice Recorder- This mini voice recorder is light and portable, convenient and easy to put in your pocket or palm; very easy to use, press the "on" button to save, press the "off" button to save. When a sound is detected, the activated audio sound can record a sound that is loud enough.Strong Magnetic Recorder- Strong magnetic suction can be attached to any place, under the bed, desk, car seat, easy to secretly record; stimulation can reduce noise; recording sound is clear.