Feature: 1. This set consists of a signal sender and two receiver trigger. 2. Globally universal 433Mhz frequency, 4 channels. 3. Transmitting distance up to 30M, no limits with directions or angles. 4. 45295 5. Universal hot shoe interface, compatible with Canon, Nikon, Sigma, Olympus, Pentax, etc. (except Minolta SONY, for they use a special hot shoe). 6. 1/4inch nut can be connected with tripod or light holder to make flashlight safe and stable. 7. Globally univeral 433Mhz frequency, 4 channels. With studio flash interface, can trigger several kinds of studio flashes. 8. Transmitting distance up to 30M, no limits with directions or angles. 1/4 inch nut can be connected with tripod or light holder to make flashlight safe and stable. 9. Energy-saving design with 12V 23A battery of transmitter and 2 * AAA batteries(not included) of receiver. Comes with a PC sync cord for cameras without hot shoe socket. 10. This set consists of a signal sender and two receiver trigger. Globally univeral 433Mhz frequency, 4 channels. Comes with a PC sync cord for cameras without hot shoe socket. 11. With studio flash interface, can trigger several kinds of studio flashes. Transmitting distance up to 30M, no limits with directions or angles. 12. Energy-saving design with 12V 23A battery of transmitter and 2 * AAA batteries(not included) of receiver. 13. Globally univeral 433Mhz frequency, 4 channels. 14. 1/4Inch nut can be connected with tripod or light holder to make flashlight safe and stable. Specification: Power of transmitter: 23A 12V mini battery(included) Power of the receiver(AC): 2 x 1.5V AAA Battery(not included) Outdoor working distance: maximum 30m / 90feet (open area, no fraise) Indoor operating distance: maximum 25m / 75feet Channel: 4 channels Frequency: 433Mhz Synchronous speed: maximum 1/250sec Color: black Material: metal and plastic. Package List: 1 x 4 Channel Transmitter 2 x 4 Channel Receivers 1 x PC Sync Cord (2.5mm to PC) 1 x User Manual(English) Note: 1.This trigger do not support TTL function.2.This item only includes the trigger set and sync cord.