This Etronix Tamiya 2S Battery Harness is designed for connecting two battery packs in series, effectively creating a 2S configuration. It is compatible with Tamiya connectors, commonly used in RC vehicles and other hobby applications. This adaptor allows for increased voltage output from your battery setup. This product is suitable for various hobbyist applications including Scalextric, Hornby, Radio Control models, and more. It is a useful accessory for enhancing the performance of your RC cars or other battery-powered devices that utilize Tamiya connectors. The brand is Etronix and the model number is ET0711.