This mini eavesdropping device is a great spy audio system, just looks like a real USB flash disk
And you can put the audio bug on table or any place, just inserting a MicroSD (TF) card into this spy audio, switching on it
Then this USB flash disk style audio bug starts to record the sound around it
Its rechargeable Li-ion battery supports to take record up to 5 hours, and the audio bug will get fresh power after you charge it through USB port of your computer.
Specification
Mini Flash Disk Eavesdropping Device, Spy Audio
Voice recording on/off switch
USB 2.0/1.1 supported
No external power required
Micro SD card slot: support up to 16G (not included)