Thank you for viewing! This is a battery socket for Game Boy, Game Boy Color, Game Boy Advance, Game Gear, and WonderSwan cartridges, allowing for easy battery replacement when the battery runs out. *A special screwdriver is required to remove the back cover of the cartridge. Once installed with soldering, you only need to purchase commercially available lithium batteries and replace them. You no longer need to prepare tabbed lithium batteries and do the troublesome soldering every time the battery dies. *Some cartridges may require some ingenuity. [Product Details] Specification: CR1616 Battery Socket Quantity: 10 *Third-party product *Color: Beige [Photo 1] Image viewed from the front The left side is the positive terminal, and the right side is the negative terminal. Insert the lithium battery (front side) in this orientation for installation. [Photo 3] Image viewed from the back *No price reduction is possible. Shipping will be done promptly, wrapped in bubble wrap.