Mini HD-DV DVR Video Camera – Smallest Digital Video Camera in the World – for only $8.99 Shipped!  You can set the camera up in a room on audio-activated standby mode, where it will sit for nearly two weeks on a single battery charge. It uses microSD, so you can store up to 16GB; it plugs into your computer via USB cable.  Watch the end of the video to see how sharp the sound and picture really is!