I was just browsing through the internet when I stumbled upon a site related to covert video recorder.A digital video recorder (DVR) or personal video recorder (PVR) is a device that records video in a digital format to a disk drive, USB flash drive, SD memory card or other mass storage device. The term includes set-top boxes with recording facility, portable media players (PMP) with recording facility, recorders (PMR as camcorders that record onto memory cards) and software for personal computers which enables video capture and playback to and from disk. Television sets with digital video-recording facilities are available; The digital video recorder simply stores the digital stream directly to disk. Having the broadcaster involved with, and sometimes subsidizing, the design of the DVR can lead to features such as the ability to use interactive TV on recorded shows, pre-loading of programs, or directly recording encrypted digital streams.The DVR800 Slider Battery Pack gives you extra battery power and time for the DVR800.The DVR800 simply slides into the frame which then gives you an amazing 6 hours of battery time. It can, however, also force the manufacturer to implement non-skippable advertisements and automatically-expiring recordings. Just visit this site now to get an idea about the covert audio recorders from spy circuit.