... 1. 2GB/4GB USB Disk Voice Recorder, Audio Reocrder, Hidden Voice Recorder 2. 2GB USB Disk Voice Recorder 3. USB Voice Recorder 2GB/4GB USB Disk Voice Recorder, Audio Reocrder, Hidden Voice Recorder User Manual Turn ... 't the driver,it can be used as a USB.) Note:If the voltage is too low,the pilot ... one charging.(2GB can storage more than 120hours voice file) When turn on after 5 second start record ...