If you need a full digital copy of the manual, several online repositories host legacy Kenpro documents:
Dual-mode transmitter settings—High ( 2.5 - 3 Watts ) or Low ( 250 - 500 mW ) to conserve battery life. Kenpro Kt 22 Manual
A comprehensive archive for Kenpro instruction manuals, including the KT-220E/EE/ET variants. If you need a full digital copy of