These Duracell Coppertop Batteries can be used to power portable and household electronic devices. AAA batteries are great for use in portable electronic devices such as computer mice, remote controls, MP3 speakers and more. These are AAA batteries and are suitable for use in remote controls, toys, speakers and more. Duracell Coppertops have been engineered to power most household and portable devices. The Duralock Power Preserve Technology ensures that batteries are guaranteed for 10 years in storage. This is a single battery.