The R Style Dot sight is powered by a standard CR2032 battery. Housed in rugged aluminum, the dot sight is extremely tough yet lightweight. With 5 available brightness settings, the reticle can be manually adjusted by pressing the plus or minus buttons on either side of the unit. To save battery life turn the optic off by pressing both buttons simultaneously and holding for 3 seconds. The R Style Dot Sight is tougher than any alternative and suitable for Airsoft Games.