Special devices require a special level of energy. Thats why zero-mercury Energizer AAAA Specialty Batteries deliver dependable power for all your gadgets. Whether its for your Bluetooth headsets, game controllers, cameras, or medical devices, youll be confident in making the right AAAA Miniature Alkaline Battery choice with Energizer. Try them out & 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.