The Explorer 9, 10W focusable HID

comes with a NiMH battery pack,
locking latches,
stainless steel fittings,
charger,
hands-free Goodman handle,
Depthrated to 500ft.
NiMh batteries provide more than 50% greater energy density than lead-acid and allow light cannisters to be a fraction of the size of conventional dive lights. Cannisters are milled from a solid rod of Delrin

Note: Picture shows an Explorer 4.5 battery canister. Please see the Explorer 9, 18w HID for images of the correct size battery canister.