All our other accessories -Wireless Wireless Trigger Highlights generic brand Wireless Wireless Trigger Description: 4 channels to avoid interference Channel selector on the outside of the transmitter and receiver The transmitter is applies to traditional or digital carema with hot shoe or PC control interface. The receiver trigger adopts dry battery for power supply, which is safe, economical and practical. The product adopts microcomputer to control decoding, which has superior anti-interference ability; Sensitive reaction speed, the maximum synchronous speed can reach 1/250 sec. specification: Transmitter power: 23A 12V Receiver power battery: 2 AAA batteries (not included) Max working distance: 30m (open area, no interference) Outdoor working distance (open area): >30M/90feet (open area , free of charge) Indoor Operating Distance: >25M/75ft Frequency Range: 4 Operating Frequency: FM 433Mhz Outdoor Synchronous Speed (open area): Max 1/250sec Indoor Synchronous Speed: Max 1/250sec Package includes: Transmitter 1Piecex 2Piece x Receivers 1Piecex Cable