Product Description The 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-t's built-in battery and establish a connection to your BOSS wireless receiver, simply follow the same procedures used with the original transmitter included with your system. From the Manufacturer WL-T Wireless Transmitter Spare Transmitter for the WL Series and Katana-Air The 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-T’s built-in battery and establish a connection to your BOSS wireless receiver, simply follow the same procedures used with the original transmitter included with your system.