Special devices require a special level of energy. That's why zero-mercury Energizer® AAAA Specialty Batteries deliver dependable power for all your gadgets. Whether it's for your Bluetooth® headsets, game controllers, cameras, or medical devices, you'll be confident in making the right AAAA Miniature Alkaline Battery choice with Energizer®. Try them out and see how these miniature batteries go big when it comes to long-lasting performance. Battery Type: Alkaline; Battery Size: AAAA; Voltage: 1.5 V; Material(s): Alkaline Manganese Dioxide.