For use with off camera flash these triggers and receivers are mounted on the camera and the flash to allow them to communicate with eachother to trigger the lights.
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.
11.Warranty time:12 months
3.User manual =1pc