Traxxas 6546 - Battery Door - TQi Transmitter - TRA6546 This is the Battery Door for the Traxxas TQi Transmitter. Features:  Plastic construction  Fits two and four channel TQi transmitters  Installs on bottom of transmitter and protects battery compartment Includes:  Battery Door for the Traxxas TQi Transmitter Part number(s) included (in factory packaging): 6546