Hahnel Viper Wireless Group Flash Trigger for Nikon Cameras

• Control up to three groups of flash guns, each group comprising of one or more flash units• TTL, Manual and Multi (Stroboscopic) mode control• LCD indicates user-friendly status of each group• TTL 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 Viper• DCM (Digital Channel Matching) to provide reliable connections• Over 100m range• Mini USB socket for external power source or firmware upgrade• Full compatibility with original & most 3rd party speedlight's• Easily adjust mode and values on a group by group basis• Powered by AA batteries