Surefire produces flashlights of widely varying sizes and power outputs from single-cell lights to large 20-cell HID models. Most of its flashlights are powered by lithium CR123A batteries that allow for compact size and low weight while offering high power output. These batteries offer a long shelf-life, but are more costly than zinc-based cells. Several flashlights are available with rechargeable battery packs. In 2010, Surefire released the E2L AA, designed to operate on AA batteries, as does the Minimus™ AA headlamp. Surefire sells rechargeable "LFP123A" lithium ion batteries for all LED flashlights as a replacement for CR123A. Surefire also produces military weapon lights for mounting on handguns, rifles, sub-machine guns and shotguns. Surefire's Z2 CombatLight is standard issue to the FBI and the Federal Air Marshal Service, and their various handheld lights are a frequent choice of police, military, fire, and EMS personnel. Some models of handheld flashlights include an integrated "strike bezel" for use as a self-defense weapon. Most of Surefire's flashlights are manufactured in the United States, although components are sometimes sourced overseas.