Flashpoint StreakLight 360 Ws Flash TTL for Canon with BP-960 Power Pack (with R2 Integrated Wireless Transceiver) Greatest power with the most compact package Fully compatible with all on camera Canon E-TTL controls including Automatic TTL Exposure Control With Flashpoint R2 Integrated Wireless Transceiver Compatible wireless TTL systems: Fully supports Canon E-TTL systems, Nikon i-TTL optical, Nikon i-TTL, and using the 2.4Ghz Flashpoint R2 radio system. Functions as Master or Slave unit in a wireless flash group.