This covert video pinhole camera is world's smallest fully functional camera for covert operation.  The camera measures just 7.25mm x 7.25mm, and is a thin 6.28mm from front to rear.  Output is NTSC with 540 TVL resolution, and is compatible with any micro DVR or video transmitter that accepts composite video signals.  Power requirements are a flexible 9 to 12 volts DC, and those with a good technical know-how can remove the cabling and power via 3.6VDC.