Strobe body only. No diffuser. Unknown manufacturer. Includes YS adapter and knob. Four Panasonic nickel-metal hydride batteries, 2021 manufacture. No other accessories. Instruction manual included. Original box included. No history of water damage or repair. Functioned normally until last week. Has scratches on the exterior from a total of 50 dives. Compatible with a two-strobe TTL system and slave firing via the underwater light remote function "RC".