1.2g/2.4g of smallest video transmitter in the world and receiver This video and audio transmitter and receiver set is truly unique. The transmitter not much bigger than a postage stamp. It can be powered by a small 9 volt transistor radio battery or any 12 volt power source and it incorporates a subminiature switch to enable the transmitter to operate on four different channels. It will transmit crystal clear colour or black & white from any of our cameras with audio to the dedicated four or twelve channel receiver. The receiver can be powered by 12 volts mains adaptor or any standard battery pack. A transmitting range of up to 300 metres can be achieved and up to four transmitters can be used with one receiver. The transmitter draws very small current enabling long battery life and it's miniature size coupled with the advantage of using the transmitter with a small battery makes concealment inside very small items easy.