Instead of CCTV camera i will suggest you to buy wireless door phone. Wireless video phone is the latest addition in this list of ‘Smart Devices’. A wireless video door phone is a safe and most reliable way of guarding the house against stealthy intruders.
There is a wide range of surveillance cameras available in the market. I bought a hidden camera from Spy3K last year to monitor my house during the nights since I've been robbed once. It is still working with no issues. You can give it a try and buy one if you like. Have a look at it http://www.spy3k.be/365_dagen_spy_camera.html