This product is a pack of 20 Surefire SF12-BB 123A CR123 3-Volt Lithium Batteries. These batteries are perfect for powering a variety of devices, from small remote controls to heavy equipment. The brand of these batteries is SureFire, a trusted name in the market. Please note that this product can expose you to chemicals which is known to the State of California to cause cancer and birth defects or other reproductive harm. This warning is in accordance with California Prop 65, a law aimed at protecting the public from harmful chemicals. Whether you're a collector or a professional, these batteries are a reliable choice for your needs.