Hahnel hl_viper hahnel viper flash trigger canon black Camera Flashes

Hahnel HL_Viper Hahnel Viper Flash Trigger for Canon (Black) Frequency: 2.4 GHz Range: 328' Digital Channel Matching Three Groups Flash Output from 1/1 to 1/128 Exposure Compensation Options Backlit LCD Display Pass-Through Hot Shoe 2.5mm and Mini-USB Ports on Receiver Each Unit Runs on 2 AA Batteries Hahnel HL_Viper Hahnel Viper Flash Trigger for Canon (Black)