Ideal as backup light. A special handle allows you to attach it also to the mask strap. – Light source:

Underwater Notebook, Scuba Diving Underwater Note Book Waterproof Paper Dairy Book with Pencil for Making Some Notes Underwater, Small Size

Beuchat Masterlift X-AIR Light 2 – Technical Data: load and air distribution for perfect trim; completely flexible adjustment for a

Underwater Notebook, Scuba Diving Underwater Note Book Waterproof Paper Dairy Book with Pencil for Making Some Notes Underwater, Small Size