Underwater Kinetics Mini Q40 Xenon6" overall. High intensity Xenon bulb with up to 38 lumen output. 4 5 hour burn time. Rugged yellow ABS case won't crack, chip or fade. Rubber sheath molded over bezel to reduce glare and improve impact resistance. Waterproof twist on off bezel. Quick load battery system. Use with mask strap attachment for hands free lighting. O ring sealed against water, mud and dust. Waterproof to 500 feet. Includes four AA alkaline batteries. This is the