The latest in the profoto line of finely designed sources of power for photography this unit is compatible with acute and acute 2 heads as well as the pro 7 plus flash head it features 4 separately controlled outlets for heads a built in radio receiver offering reliable wireless sync from up to 300m away and an 8 f stop power range to enable subtle lighting effects please note that using older pro 3 pro 5 pro 6 pf pb or pro 7 heads may result in overheating due to slower fan speeds in