Lorex SG6331 2.4 GHz Wireless B/W 4-channel Monitor and Camera System B/W CMOS image sensor in camera, 5.5-inch B/W picture-tube screen in monitor Wireless camera can transmit to receiver up to 300-feet away Built-in audio on camera, monitor has A/V out for VCR recording or TV monitoring Camera achieves 240 horizontal TV lines resolution, monitor capable of 280 TV lines at center Camera can run on 4 AA batteries for 4-5 hours, monitor on 10 C batteries for 2-3 hours, making unit totally portable