Batteries Not Included I’ve been using this dive light for almost a decade. The light is turned on by twisting—no buttons—which I prefer because buttons often get turned on by mistake and drain the battery during travel. It can be powered by three AAA batteries or one flat top 18650 rechargeable battery. I prefer to use the rechargeable 18650 batteries, and I will attach links below for both the batteries and my preferred chargers. (There are cheaper options online; I’ve just had the best luck with these brands.) I normally get about one hour of full-brightness burn time with the 18650 batteries. After that, the beam begins to fade but will continue to work for around two hours. I can usually dive the whole day on one battery as long as I turn it off between uses, but I always carry spare batteries to be safe. 2000 Lumens IP68 Rated up to 200M Aluminum Frame 1-2 Hour Burn Time Requires 3 AAA Batteries or 1 flat top 18650 rechargeable battery (Not Included) Wrist Lanyard Spare O-rings Links for my preferred battery and chargers Rechargeable Batteries 2 Battery Charger Single Battery Charger If you have any problems with, or are unhappy with any of our products. Please send me an email at [email protected] and we will do our best to make it right.