1.4 Channels with hot-shoe connector for external flashes 2.The receiver has an on/off switch 3.Transmitter -- 12V-23A 4.Receiver -- 2 x AAA batteries 5.Operation frequency: 433MHz 6.Max. working distance--30m (Open area without interference) 7.Max. Sync Speed - 1/250s (depending on camera and flash) 8. Works for majority of older flashes used with film cameras. 9.Warranty time:12 months 10.OEM is OK.