The pocketwizard plus iv auto sensing transceiver allows photographers the benefit of both on camera ttl flash and remote manual flash control used as a transmitter the top shoe provides on camera ttl compatibility with most canon nikon panasonic fuji and olympus cameras in receiver mode it will pair with virtually any flashgun for manual remote control featuring 32 channels in 4 separate zones and powered by two readily available aa batteries it is an ideal wireless triggering system for