1.push a button to adjust the focus,it is a dual LED flashlight.
2.mechanical clicky switch,Inside the aluminum substrate, the outside is aluminum alloy shell, are good heatsink internally.
3.The flashlight have memory, it will begin from last time you have chosen.
4.the ring on the tail be well isolated due to the screw/unscrew movement.
5.For the battery we also can increase it to 3500mAh, but the price will be different.