This tactical flashlight comes with everything you need right out of the box to own your Mil-Sim or indoor game. First off, you don't have to purchase extra expensive batteries because the flashlight comes with a rechargeable battery (charger included). This saves you a lot of money in the long run. Even though this flashlight comes with everything you need at a great price, we didn't want to sacrifice reliability or performance. That is why it is manufactured out of aircraft grade 6063-T6 aluminum and the CREE LED light is made in the USA. The CREE LED light shines a continuous and concentrated beam of 220 lumens on your target. Also, we've tested this flashlight for reliability by submerging it into a bucket of water for 20 minutes and throwing it against concrete to see if it would meet our standards. It surpassed them. So if you are looking for a reliable and high performance tactical flashlight then go no further.