- ! ! ! NOTE: For Traxxas UDR models, the connector needs to be replaced due to the different power supply. Or configure a small battery just for power supply! ! ! The ESS sound pack can only withstand a battery voltage of less than 3S. If your battery exceeds 3S, you need to install an external battery of less than 3S. Batteries exceeding 3S will cause overvoltage damage to the sound pack. The product does not support using Win11 system to set up and purchase download sound effects.If you have any questions, please email Amazon. Brand: PYFORE, we have a professional technical team to serv.