Standard battery module BM3500B. Comes with a float jacket. Purchased new in 2021. I used this for about 300 dives, but it doesn't suit my shooting style, so I'm selling it. This model is no longer sold (I believe it's an early model). The condensing lens is unused. The hand grip has only been used a few times. Spare O-rings are included, so I recommend replacing them before use.