The Varta V10GA battery is a 1.5 Volt alkaline button cell battery. Its a popular alkaline cell commonly used in watches, calculators, small electronics, toys, lasers, digital assistants, keyless entry systems, digital thermometers, LED lights, electronic books, pedometers, calorie counters, stop watches, sporting goods & medical devices. Varta goes beyond the basic battery sizes to bring you the ones you need. This is a "SW" low drain battery. Low drain batteries are best used in devices that use a small amount of power over a long period of time: Analog watches, TV remotes, alarm clocks, etc. This is in comparison to high drain batteries, which are for devices with a continuous, low power use and occasional high peaks: Analog and digital watches with extra functions (backlight, alarm), pocket calculators, electronic games, cameras, etc. Specifications Chemistry: Alkaline Voltage: 1.5V Amperage: 50mAh Diameter: 0.45in Height: 0.21in