With a smartly designed battery compartment, the YongNuo YN-468II flash lets you change its batteries easily. The optical slave sensor of this YongNuo flash for Canon allows you to sync it with other flashes. The AF assist light of this shoe-mount flash enables focusing in darkness. With a built-in PC sync port, you can trigger this YongNuo flash for Canon via the PC sync cable. As the focus of the lens changes, the auto-zoom capability moves this shoe-mount flash forward and backward, for illuminating different zones. With the TTL mode in the YongNuo YN-468II, the flash’s output can be adjusted according to the illumination reflected back.