Inon Z-220 is a compact reliable underwater strobe that operates on four AA batteries. This item is scuffed up on the exterior, but in good working condition. It comes with a diffuser, a one-inch ball attachment, and the owner's manual. Sync cord not included. Works with a variety of underwater camera housings, but check with your housing manufacturer to determine if this strobe is compatible with the flash circuitry in your housing. Can also be used as a slave strobe, with no compatibility questions.