This is a new option because the new RailCam or HobbyCam Receivers can receiver up to 4 cameras

Each camera comes with a 9v Battery Clip and  a AC Adapter

380 lines, 510 x 492 pixels, NTSC, 3.0 Lux

Includes nice mounting bracket that tilts

Camera transmits 2.4 Ghz and each camera can be adjusted for a specific 2.4 frequency

Can only be received by 2.4 Ghz RailCam Receiver, 2.4 Ghz HobbyCam Receiver or New 2.4 Portable Monitor

These "Extra Cameras" will not work with any 1.2 Ghz Receivers