Looks just like a remote car key but is really a hidden camera and a built-in mini DVR. No drivers or outside power source needed. It will charge plugged into your computer with the included USB cord. It holds 8 Gigs of files which you can watch on practically any media software that supports AVI files. This is over 3 hours of recorded material before you need to delete or download. Just view on your computer. The battery will last up to 2 hours on a single charge. Dimensions 2" x 1 1/4" x 3/8" Includes: Car Key DVR, USB Cord for recharging and transferring video/photos, User manual, Gift Box Specifications: Video format: AVI, Video Resolution: 640x480 at 30fps, Camera Resolution: 1280x960, Battery:280mAh 3.7V, 29 Frames Per Second (FPS), Dimensions 2" x 1 1/4" x 3/8"