Camera Flash: Flash mode: TTL,M,MULTI Flash time: 1/200s~ ... triggering distance: 20~25m indoor, 10~15m outdoorSlave groups: 3(A, B, and C)Channels: 4Zoom range: auto, 24, 28, 35, 50, 70 ... : Rear-curtain sync, FEC, FEB, FEV, modeling flash, manual zoom, auto zoom, sound prompt, advanced setting, automatically saving setting, PC port ...