Features 1.Fit for Nikon/Canon speedlite 2.4 Channels with hot-shoe connector for external flashes 3.The receiver has umbrella holder 4.The receiver has an on/off switch 5.Transmitter -- 12V-23A 6.Receiver -- 2 x AAA batteries 7.Working frequency: 433MHz 8.Max. working distance--30m (Open area without interference) 9.Max. Sync Speed - 1/250s (depending on camera and flash) 10.Works for majority of older flashes used with film cameras. Package 1.Receiver =1pc 2.Transmitter =1pc 3.User manual =1pc