The Duracell DL1220 CR1220 3V Lithium Coin Cell Battery is a long-lasting and reliable power source for various applications. With a diameter of 12mm and a height of 2mm, these batteries are lightweight at 5 grams each. Manufactured by Duracell, known for their quality batteries, these CR1220 batteries have the longest expiry date, making them ideal for low drain applications in the Sound & Vision category. Their Lithium chemistry ensures consistent power output, making them a practical and convenient choice for powering devices that require long-lasting batteries.