Flashpoint Streaklight 360 TTL for Canon (with R2 Integrated Wireless Transceiver) - AD360II-C Flashpoint 360 TTL Canon Strobe Body - 360ws Flashtube - Reflector with 2 Diffuser Disks - Flash Foot - Hot Shoe Alternative 1/4"-20 Base Plate - Battery Connection Power Cord - 1 Year USA Flashpoint Warranty - Requires Flashpoint Blast Pack BP960 or equivalent power source Greatest power with the most compact package, in many case precluding the need for AC powered strobes Fully compatible with all on camera CanonE-TTL controls including Automatic TTL Exposure Control, Exposure Bias, Bracketing, Second Curtain Sync, HSS, EXIF Recording, Modeling Flash, and Flash Exposure Lock. 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.