This is the Diverite HP50 Handheld Scuba Diving Dive Light Features: Batteries 4 x 18650 3400 mah Li-Ion (User Replaceable) Burn Time on High 1.5 hours Burn Time on Medium 3 hours Burn Time on Low 30 hours Burn Time on Strobe 15 hours Handheld Head Size 3.5 in (8.9 cm) length, 2.0 in (5.0 cm) diameter Handheld Light Size 6.4 in (16.3 cm) length, 2.15 in (5.46 cm) diameter Weight (Ready to Dive) 1.4 lbs (0.64 kg) Buoyancy (fresh water) 0.6 lbs (0.27 kg) negative Included Items: HP50 Light Head Handheld Battery pack 4 x 18650 3400 mah Li-Ion Batteries Soft Handmount with Locking QRM Mounting System 4 cell Li-Ion Charger Soft travel Case Dive Rit's all new HP50 raises the bar for technical lighting systems. Completely adaptable to any dive mission, the HP50 easily transforms from a compact, lightweight travel companion to a rugged workhorse capable of boundary pushing, multi-hour technical dives. At its heart, a next generation multi-die Cree XLamp XHP50.2 LED provides unparalleled output, efficiency, and reliability. A unique light head design offers improved heat sinking and features a cross drilled water channel that provides a direct thermal path from the back side of the LED chip to the water for maximum output and efficiency. A magnetic rotary switch controls 4 modes of operation: High, Medium, Low, and Strobe. An integrated microprocessor control unit continuously monitors battery voltage and temperature to keep the light operating at peak efficiency. As battery voltage drops, light output steps down eliminating the possibility of suddenly being left in the dark due to a dead battery. The light alerts the diver of this step down in light output by a series of flashes, after which, the light produces a minimum of another 4+ hours of usable light. In a sea of cheaply made imports, the HP50 stands out and is proudly designed, manufactured, and assembled in the USA.