The Battery Plug Charge Indicator Set includes 12 Traxxas Battery Charge Indicator Plugs, featuring four green, four blue, and four grey plugs designed to help manage the charge status of your batteries. The green plugs indicate fully charged batteries, while the blue plugs signify LiPos that are charged for storage. The grey plugs are used to indicate discharged batteries, ensuring you always know the state of your power sources. In addition to charge management, these plugs also serve to protect battery plug terminals from dirt, corrosion, and foreign materials during storage and transport, enhancing the longevity and reliability of your batteries. The set is an essential accessory for various Traxxas models, making it easier to keep your batteries in optimal condition while enjoying your hobby.