Check the listing for details. BRAND NEW Hahnel Viper Wireless Flash Trigger Set for Canon Cameras. Color: Black, Condition: New. Listed at 43.99 USD. ⚡ Fast and free shipping! Most items are shipped same day with 1-3 day priority mail. Hahnel Viper Wireless Group Flash Trigger Set for Canon Cameras. Brand new in box. The Viper Wireless Flash Trigger Set for Canon Cameras from hahnel provides multi-group wireless flash control to Canon cameras. It operates with a radio frequency and has a range of 328'. The system uses digital channel matching to connect up to three groups of receivers with a transmitter and avoid interference from other devices.Flash output can be set via the transmitter for each group with intermediate stops. This is all shown on the transmitter's backlit LCD display. A manual mode is available for setting options on the flash itself and there is a pass-through hot shoe on the transmitter for TTL control of a mounted flash.The receiver features both 2.5mm and mini-USB ports for connecting to flash units. The micro-USB ports on both units can be used for external power or firmware updates. Both the transmitter and receiver units run on two AA batteries.Batteries not included.BenefitsControl up to three groups of flash guns, each group comprising of one or more flash unitsTTL, manual and multi (stroboscopic) mode controlLCD indicates user-friendly status of each groupTTL pass-through hot shoe on transmitter allows E-TTL speedlight's or other TTL systems such as Canon ST-E3 or Tuff TTL to be combined with the ViperDCM (digital channel matching) to provide reliable connections over 328' rangeMicroUSB socket for firmware upgradesCompatible with original speedlights and the MODUS 600RT MK II & MODUS 360RTEasily adjust mode and values on a group-by-group basis