This is the Traxxas AC to DC 40-watt wall power adapter designed specifically for use with the Traxxas peak detecting DC fast chargers. The new AC to DC Adapter from Traxxas lets you plug your charger into a standard AC wall outlet at home or the track. Get the most out of your Traxxas DC fast charger with the Traxxas AC to DC adapter. This is a must-have accessory for all Traxxas or LaTrax vehicles supplied with the 2-amp or 4-amp DC charger!