YongNuo Wireless Remote Flash Trigger for Canon 430/580 EX DSLR Digital Camera
4 Channels Selectable - Wireless Flash Trigger Receiver V2s Works with V2/V2s wireless flash trigger only - Designed for Vivitar 285HV Sunpak 433 Sunpak 383 Olympus FL-36 and other flashes which (1) comes with a trigger voltage lower than 12V and (2) could not be triggered by V1 or V2 receivers; - Transmitter Power: 23A 12V battery - Receiver Power: AAA Battery - Maximum Working Distance: 30m (open area without interference) - Working Frequency: 433MHz - Comes with PC sync port