The product is a pack of 50 Maxell 371 SR920SW SR920 Silver Oxide watch batteries. These coin cell/style batteries are made in Japan and have a voltage of 1.55V. They are ideal for use in a variety of consumer electronics devices, providing reliable power for a long time with their silver oxide chemical composition. Perfect for keeping your devices powered up and ready to use for an extended period, these batteries have an expiration date of 2028.