BOSS WL-T Wireless System - Spare Transmitter For WL And KTN-AIRCompatible with WL series wireless systems and the Katana Air wireless guitar amp Provides 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 The WL T works with WL 20, WL 20L, WL 50, KATANA AIR, WAZA AIR Note: The WL T has no audio functionality as a standalone device. To transmit sound, it must be used in conjunction with the wireless receiver in one of the