This light can be installed in Ocean Rhino's new style muzzle model GX300L, which has a 9/16" diameter muzzle port. 
The power Tech 1 Light has a depth rating of 100 meters (328ft) and is powered by one AA alkaline Battery. The alkaline battery will produce approximately 180 lumens with a burn time of about 3.5 to 4 hours. If you require a higher lumen output you can power the light with a Lithium rechargeable battery. The AA Lithium battery will produce approximately 500 lumens with a burn time of 2.5 to 3 hours.

Light includes:

1 AA alkaline battery

2 Spare O rings