YONGNUO YN560-IV SPEEDLITE
2.4 GHz Transceiver with 328' RangeGuide Number: 190' at ISO 100 and 105mmZoom Range: 24-105mm (18mm with Panel)Output Range: 1/1 to 1/128Tilts -7 to 90° & Rotates 270°Optical Slave FunctionalityRecycle Time: 3 SecondsMulti Mode for Firing Series of FlashesPC Sync PortRuns on 4 AA Batteries