The ATACTICAL A1S flashlight outputs 1150 Lumen, and it’s designed to withstand the toughest abuse. It has an all metal construction and glass lens with a metal belt clip. The included battery inside is a 18650 battery which integrated usb built in charging port. This allows for direct charging using any USB charger and you will not need to buy any special charger. There are 4 brightness setting including SOS mode. It will also remember the last setting you have.