iGearPro 16GB USB Flash Drive Digital Audio Voice Recorder
Voice recorders don't get much more basic than IGearPro's mini USB flash drive recorder. It has up to 16GB of internal memory and offers bitrate quality of up to 384 kbps in WAV format. Since this is a flash drive, the unit plugs directly into any PC or Mac to play back your audio files through just about any sound software. No need for any downloading of drivers with this unit, just plug it in and you're ready to go.
This recorder works on a rechargeable battery that requires a USB for recharging, but it cannot charge while in use so you have to pick between one or the other and unfortunately it isn’t a voice activated recorder. But for around $20, you could probably look past those issues considering how much storage and recording time you get in this tiny device.