Yongnuo YN560 IV Speed Light

2.4 ghz transceiver with 328' range guide number: 190' at iso 100 and 105mm zoom range: 24-105mm (18mm with panel) output range: 1/1 to 1/128 tilts -7 to 90° & rotates 270° optical slave functionality recycle time: three seconds multi-mode for firing series of flashes pc sync and hv power ports runs on four aa batteries