Ano HL4000 technical dive light is upgraded on the beam angle, which is lower than 8 degree and minimized the peripheral beam in order to penetrate better in the muddy water and avoid the reflection from peripheral beam. HL4000 is considered more for tech divers. It has 4000 lumens output and self-contained battery pack that provides 6 hours burn time at low mode. A very unique and convenient design for charging system and the user just needs to drop the dive light into the charger seat for starting charging. The neoprene soft hand grip is replaced the Goodman handle, which is more comfortable and convenient when the diver ears thicker gloves (coming with package in free of charge).