Improved Construction: Battery leaks are a problem that can damage devices. Energizer has made improvements in our battery construction in recent years to help prevent alkaline leakage issues to ensure your devices are powered and better protected. Superior Service: Designed for electronic applications which may require high rate pulses, this A23 Battery has a Magnesium Dioxide chemical system to offer superior service at all drain rates, optimal cold temperature performance and a longer shelf life. Free of Mercury: Energizer’s A23 Alkaline Batteries feature advanced engineering and state-of-art manufacturing with zero mercury to responsibly power your devices with less impact on the environment. Multi-Purpose Use: Compatible with a variety of devices, these Energizer A23 Batteries provide reliable power for keyless entry systems, calculators, remotes, cameras, video game controllers, headsets, glucose and blood monitors, and more. High-Quality Batteries: Special devices require a special level of energy. As such, these Energizer A23 Batteries are built to meet the requirements of today’s high-powered devices – designed to deliver dependable power for all your gadgets.