The Plus III is a radio transceiver, capable of acting as a transmitter or receiver for triggering remote flashes and cameras. It requires at least one other PocketWizard radio for wireless triggering. It can be connected to almost any remote flash or camera with the proper cable. The Pocket Wizzard system is one of the most relyable radio trigger systems on the marked. It can be used to triggerflashsystems and cameras. The Pocket Wizzards have to match the area law to been used (USA /Asia/Europe) . All our Pocket Wizzard systems are for the european marked. Some manufacturers build in receivers in their flashunits. Before renting a radio system make shure to check which receiver you need. Anyway renting a transmitter and recheiver from one brand will work with any flassystem. Additional cableling might be needed depending on the way of use. Please check with our shops. This unit is only albe to transmit signals. 4 channels, 2 3,5mm in/out jacks, one hotshoe adapter. 2x batteries LR6 (AA) included