Wireless remote system for Canon EF mount flashes. Includes one main controller and two receivers + one additional receiver (The +1 receiver has a loose strobe terminal and makes a rattling sound. This one is considered a bonus as it powers on and syncs, but is a junk item). Power and sync have been confirmed. However, TTL flash has not been tested as I currently do not own a Canon camera or strobe. Please understand this before purchasing. Overall, there is a feeling of use. The instruction manual is only in English and Chinese. There is no box, and there may be missing accessories. Batteries are not included. Everything in the first photo is included. Thank you for looking.