The Zeikos 680EX Electronic flash is the perfect alternative to the original Canon brand flash. It supports all of the current TTL & E-TTL Cameras. It features 7 levels of power ratio and has a bounce & swivel head. The flash also features a auto or a manual zoom so that when you zoom your lens in and out, the flash will follow suit. It has a digital LCD display on the back. it has a guide # of 185 at ISO 100. It comes with a soft case.