So my sister needs a Nanny Cam, and we know next to nothing about such. But we know what we need in general. So if anyone knows about this stuff... help! 
If anyone knows where to buy; has bought from a place before, please share.
Thanks all!

- Small and Covert -- it's going to go on a shelf up on the wall, not to be known it's there
- Wireless (Battery Operated) -- a wire coming down from said shelf would be pretty obvious!
- Video and Audio recording
- 8-12 hour minimum operation per-charge (recharge-able)
If anyone knows where to buy; has bought from a place before, please share.
Thanks all!