This is the Traxxas High-Voltage Power Amplifier for the Traxxas Unlimited Desert Racer trucks. This is used to supply power to the accessory LED light kit for the UDR.
Replacement high-voltage power amplifier for the 7885, 8485, and 8990 LED light kits
Replacement Part For
Unlimited Desert Racer (UDR)
Accessory Part For