C1390B24 Small Wall Clock B/W Camera Wireless (2. 4 Ghz). Our Small Wall clock fits into any setting. The Wall Clock is a fully functioning surveillance system, with a high quality CCD camera built inside, the camera is virtually hidden. We integrate a 2. 4 GHz 4 channel transmitters to create a wireless system for ease of placement and include a matching 4 channel receiver. Why 4 channels? This allows the user versatility in a wireless application. Each small wall clock has a choice of black and white or color camera. more info