The PocketWizard Plus 4 provides on-camera TTL flash operation with Canon, Nikon and Panasonic cameras, coupled with multi-flash manual remote triggering. It has 32 selectable channels (16 standard, and 16 for quad-zone operation) to ensure no interference with other photographers operating in the same area. Four separate zones can be independently selected to allow single or groups of flashes or cameras to be turned on or off. Using the EC-approved 433MHz wavelegth up to a range of 500m, the Plus IV operates as a transmitter or receiver, and automatically detects in which mode it needs to operate (e.g. when attached to a camera hot shoe it sets to transmitter). It can trigger a flash and a camera simultaneously. A backlit 2.5cm display shows battery status, selected zones and channel and operation mode.