PocketWizard PW-MMAX 802-450 MultiMAX Transceiver (Black) A choice of thirty-two 16-bit digitally coded channels makes it possible to trigger all of your lights simultaneously Selective Quad Triggering allows you to isolate up to four specific groups of lights Lag Time Equalizer software measures the reaction time between the moment your camera receives the trigger signal SpeedCycler mode enables sequential triggering of up to four individual Creative blur effects can be created using the Rear Curtain Sync feature, which fires the flash at the end of the exposure.