• Large and small "standard" jack plug syncs (3.5/6.35mm)
• 4 Selectable Channels - isolate intereference or use with multiple head scenarios 
• Advanced independant channel isolation & operatation
• Trigger life up to 10,000 actuations on one user changeable battery.
• Sync Speed - camera dependant.
• Range max. 15-50m

QUAD Set includes three extra Receivers so that all heads in a 4  head setup (HiKey setups for instance) are covered by radio triggering.  This kit would be required in scenerios where the slave Flash Head needs to be isolated from IR signals (other peoples flashes at a wedding or catwalk show for instance) or where there may be problem with IR (Infra Red).