Specifications: Model: AD600BM Guide Number: 87(m ISO 100,with standard reflector) Flash Duration: 1/220 to 1/10000 seconds Power: 600W Power Output: 9 step(1/256-1/1) Stroboscopic Flash: Provided(up to 100 times, 100Hz) Sync Mode: High-speed sync (up to 1/8000 seconds), first-curtain sync, and second-curtain sync Delay Flash: 0.01-30 seconds Mask: Support Fan: Support Beeper: Support Modeling Lamp(LED): 10W Optical Slave Flash: S1/S2 Flash Duration Indication: Support Display: Dot-matrix panel Wireless Flash Wireless Flash Function: Slave, Off Controllable Slave Group: 5(A,B,C,D,E) Transmission Range(approx.): 80m Channels: 32(1-32)