Adventuring with the PT16A High Lumens Tactical Flashlight. This is very handy for keeping your hands free underwater, lighting with the red light you can create very nice effects. 
Max 3000 Lumens & Max 458 Meters Beam Distance
Multiple Modes (low,mid,high,turbo,lockout,memory,strobe,soso)
Handy Accessories (Finger ring, 360 Degree rotable holster,pocket clip,tactical ring,lanyard)
Video by EKE ACRES 
If you are interested in it, check the link to get it!
Product link: Brinyte PT16A
This is an amazing flashlight getting all this performance of a single AA Alkaline battery. Your link refers to this AA cell it’s being power source three times in the descriptions listed below. Can other cells be used?
AA? It’s a 21700 light.
Maybe they should correct the description then in the one link they provide.
Because Amazon has restrictions on lithium-ion electrons. So we have to label AA batteries to prevent the product from being taken down. In fact, PT16A does use 21700 battery
Yes,it’s 21700
