This is a conveniently packaged CR2032 battery with wire leads already attached and a JST SHR-02V-S-B 1.00mm Pitch connector. CR2032 Lithium cell CMOS batteries are usually used for remote controls, but, more frequently, computer and laptop motherboards. They are also great for powering brush robot projects. Each battery is 3V. PLEASE NOTE THAT BATTERIES ARE NOT-RETURNABLE GOODS - YOU WILL NOT BE ABLE TO RETURN THIS ITEM.