Mini Waterproof Wireless CMOS Car Rear View Camera With 1/3 inch CMOS, 420 TV Lines, 170 Degrees View Angle, 2 Pieces LED Lights, Wireless Transmission Distance Can Be Up to 50 Meters
This thing cuts in and out and the distance from transmitter to receiver is the length of my Dodge Ram.  Good picture when it works.  Going to have to run a wire for video since the wireless is unreliable.