The high intensity Mini Q40 is lightweight enough to attach to your mask strap for hands free illumination of gauges and close-up marine life. It outshines many lights three times its size 2.1 watt high brightness xenon filled lamp Rubber sheath molded over bezel to reduce glare and improve impact resistance. Works well as a photographers spotting light. Fits Sea & Sea, Ultralight and other camera mounting adapters. Tough, non-corroding ABS and polycarbonate plastic construction. Includes mask strap. • Batteries: No • Bulb: Xenon • Burn Time: 5-6 Hours • Carry System: Lanyard • Finish: Yellow • Material: Plastic • Output (lumens): 50 • Power Source: AA, x 4 • Special Features: N/A • Submersible: 500 Feet • Switch: Twist On/Off Bezel