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These are what is known as “keychain” cams
But these are the very best of the lot. These cams are easily removed from the case and modified for sophisticated control.

I may at some future date publish my circuits and software to modify these cams...if I do it will be at the rcgroups site. I use a one dollar processor to add functions (ATtiny88)

They are from China.
I buy in bulk but even singly they are VERY cheap.
Buy ONLY from these 2 sellers...all others are far inferior in design.

The cameras are the 808 #16 units

http://www.ebay.com/itm/Mini-DVR-808-Car-Key-Chain-Micro-Camera-16-Real-HD-720P-H-264-Pocket-Camcorder-/180776698380?pt=US_Surveillance_Digital_Video_Recorders_Cards&hash=item2a1721820c

http://www.ebay.com/itm/Mini-DVR-808-Car-Key-Fod-Micro-Camera-16-Real-HD-720P-H-264-Pocket-Camcorder-Ne-/320816643633?pt=US_Surveillance_Digital_Video_Recorders_Cards&hash=item4ab2297e31

This site has lots of good info about the #16 cams and links to sample video. These guys stick the little cams on RC planes and drones.

http://www.rcgroups.com/forums/showthread.php?t=1556994