SPECS: Machined aluminum, matte black anodized finish. Uses two CR-123A lithium batteries, included. 2.5 hours continuous light operation. TLR-1/TLR-1s – 3¼" (8.3cm) long, 1½" (3.8cm) wide, 17/16" (3.6cm) high, mounted. 4.1 oz. (116g) weight, including batteries.