This Swann SW231-HOY wireless surveillance camera can be placed up to 50 m away from its 2.4 GHz receiver. In fact, thanks to wireless technology, this camera offers a highly flexible solution to surveillance and even has night vision with a range of 5 metres. The SW231-HOY has a built-in microphone and a 1/3 CMOS sensor that captures images in a resolution of 380 lines.