The LED1800XMB3 is the latest innovation in underwater lighting from Sartek. The LED1800XMB3 answers diver's concern with travelling with dive light batteries. The LED1800XMB3 can use a wide variety of battery chemistries and sizes such as: 26650,18650, 22430,134A Rechargeable Lithium Ion Cells, C and AA rechargeable NiMH Cells and even C and AA Alkaline Cells. Going on a dive and find out your rechargeable battery pack for your light is dead? Drop 3 C cells in the canister and you a ready for a full day of diving. The LED1800XMB3 produces 1800 lumens of 6000 degree light. The battery canister is 2" in diameter and only 8" long, the lighthead is 1.75" diameter at the head and 3.5" long. The lighthead and the battery canister are machined from Solid Delrin rod, a extremely strong and durable engineering polymer. The battery canister is double O ring sealed and is activated by turning the cap clockwise for ON and Counterclockwise for OFF. This system is the epitome of the KISS principle. The LED1800XMB3 system is also available with Wetmateable connectors that permit the connection of multiple lightheads for video or to power both light and suit heat power.