l 2.4GHz frequency channel selected function, can work with 4 cameras the same time. l Receiver can be separated 4 group wireless signal scrambled receiving. Different frequency channel can have different range. l No need wire connection installed, can match with any kinds of mini camera or TV, DVD to constitute a perfect safety and converted wireless wiretap group  l Low power consumptions, superb pocket, can match with any kinds of mini camera for hidden wiretap. l Transmitter/receiver can use battery directly, easy outdoor using. l 0.1 WATT power transmitter can transmit A/V signal, wireless receiving range will be sea of level 300m.