Boss WL-T Wireless TransmitterThe WL T Wireless Transmitter is compatible with WL series wireless systems and the Katana Air wireless guitar amp, providing a spare to use if your original transmitter is lost or damaged. When pre charged, it also functions as a backup transmitter for live performances. To charge the WL Ts built in battery and establish a connection to your BOSS wireless receiver, simply follow the same procedures used with the original transmitter included with