This is the UK Mini Q40 MK2 Compact LED Scuba Diving Light with Mask Strap Features: 250 lumens / 5 hour run time Push button rear switch Mask strap included for hands free use New optics system for better visibility Depth rated to 100 m Battery Type: Alkaline Disposable Battery Description: 4AA Alkaline Dimensions : 7.5 x 1.6" x 1.4" / 19.05 x 4.06 x 3.56 cm Weight: 6.00 oz / 170.10 g Made in USA The Mini-Q40 MK2 is a compact and reliable dive light with performance you&';ve never seen from a light this small. A strong focused beam cuts through murky water with ease and lights up any dive, day or night. It is equipped with a convenient push-button switch that&';s easy to use even with heavy gloves on. Perfect for travel and those long dive trips, the light only weights 6 oz, measures 7.5" in length, and is easy to pack due to its small size.