Thank you for viewing! This is a socket that allows for easy battery replacement for Game Boy, Game Boy Color, Game Boy Advance, Game Gear, and WonderSwan cartridges when their batteries need replacing. *A special screwdriver is required to remove the back cover of the cartridge. Once installed with solder, you only need to purchase commercially available lithium batteries and replace them. You no longer need to prepare tabbed lithium batteries and solder them every time the battery runs out. *Some cartridges may require some ingenuity. [Product Details] Specification: CR1616 Battery Socket Quantity: 40 pieces *Third-party product *Color: Beige [Photo 1] Image seen 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 2] Image seen from the back *No price reduction is possible. Shipping will be done promptly by wrapping the items in bubble wrap and placing them in a Yu-Packet Post Mini envelope.