It�s volume exquisite-complete set volume only like the hand size, easy to carry; complete functions-support operations under many kinds of condition and at the top of camera without battery. Sensitive responds-to control the camera shutters operation in anytime and anywhere. Pretty shape-the modern and professional design, good communication with machine. Easy installation-hot shoe locking, to insert hot shoe. It�s supports the multistage frequency trim combination, the transmitter and the receiver set four digit switch codes separately and supports 15 groups to correspond with remote control combination and has the really good anti-jamming. It�s easy to operation with all functional keys and supports single-frame, continuous-frame, bulb mode, has the time delay photography as well as the group racket function, this is the excellent controller for the professional photography.