I bought this Sunny divelight to replace an Ikelite that was always challenging to open and close when replacing batteries. The Sunny screws open/closed like a regular flashlight making battery changes a breeze. It's a nice bright light and still small enough to put in a BC pocket with the lanyard attached to a carabiner to avoid losing it. There is a simple lock to prevent it from turning on accidently. This is a nice medium-sized divelight and I recommend it.
Seavenger first sent me the wrong product but was very helpful about correcting that. They emailed me a UPS shipping label for the return and promptly sent me the Sunny dive light I ordered. So, I am pleased with the customer service too.