GP high voltage battery 27A is your go-to for powering entry devices including garage door openers, wireless doorbells and locks, as well as remotes, dog collars, and medical devices. It is built to deliver long-lasting maximum power output that is stable throughout use, keeping up with todays energy-demanding technology. Engineered to offer complete protection against leakage with its secure technology, it ensures high safety for you and your device. These batteries are developed to withstand the test of time and are guaranteed with a 3-year shelf life. Our alkaline button cell is mercury-free, reducing its impact on the environment.Equivalent models: A27, MN27, V27A, 27