CR123A, 2 Pieces, 3V Lithum Batteries, ideal for BARSKA laser sights and flashlights, not rechargeable Replacement batteries for BARSKA GLX Green 5mW Laser Sight Model# AU11408, GLX Red 5mW Laser Sight Model# AU11406, GLX Green 5mW Tactical Laser Sight Model# AU11404 and Tactical Red Laser Sight with flashlight and mount.