These premium 9V alkaline batteries excel in today's power-hungry devices including high-powered toys, smoke detectors, wireless microphones and more. Plus, they're designed to prevent damaging Battery leaks and tested twice prior to shipment to ensure reliability. Specially formulated for power-hungry, high-tech devices, the energy-dense Rayovac® Fusion™ premium formula provides more power than Rayovac® high energy. No competitor's alkaline batteries outlast Rayovac® Fusion™ premium alkaline 9V batteries. Average ANSI performance test. Rayovac® Battery, Advanced Performance, Series: Fusion™, Alkaline, 9 V Nominal, Snap Terminal, Steel Case, Up to 5 years Shelf Life, 26.5 mm L x 17.5 mm W x 48.5 mm H