
The $US170 system consists of two parts: a rechargeable wireless camera about the size of a pack of cigarettes, and a 7cm wireless receiver/display. Mount the camera, plug-in the monitor up to 9m away, and watch the live stream.
Apparently, the camera also has night vision capabilities (or at the very least works in low-light situations), and can record video to an SD card, which can you then copy over to your computer. [Brick House Security via Gearfuse]