ORCATORCH D510 is a portable flashlight with a mechanically rotary switch for technical diving use. The rotary switch offers high reliability underwater.Using the latest USA CREE XM-L2(U2) LED, it can reach 900 lumens output. And using C batteries, its runtime can be over 4 hours. Plus simple style appearance, robust water pressure resistant construction, we believe it will be a r eliable lighting tool for diving. 209mm¡ê¡§Length)*35mm(Diameter)*49mm(Head) 313g(excluding battery)