No external power source required The device operates without an external power supply, reducing desk clutter and simplifying setup. Versatile functionality This controller supports multiple key types and configurations. It works with vertical manual keys, horizontal paddle keys, and semi automatic mechanical keys, and it accommodates all forms of automatic keys without compromising functionality. Compact and portable Designed with a small footprint, this CW key controller is easy to transport and fits neatly in tight spaces. It requires minimal desk space and can be placed wherever you have a radio and a key. Easy to use with two flexible modes The setup is straightforward and purpose driven: Exerciser mode: connect manual electric keys and automatic electric keys to their respective interfaces for practice and training. Key controller mode: connect the automatic key to its interface while routing the radio to the output or manual key interface. Two clear operation modes for practical applications Practice and training: use exerciser mode to simulate and test different key types and timing without altering your radio configuration. Onair control: use key controller mode to manage automatic keys while your radio connects to the output or manual key interface, enabling seamless operation in real setups. Compatibility and performance attributes Broad compatibility with various key configurations and radio interfaces. Reliable performance through simple, debouncefriendly connections and straightforward switching between modes. No external power source required, minimizing setup complexity and cable clutter. Use scenarios and applications Amateur radio practice at home: mix vertical manual keys and automatic keys to build versatility and fluency with different keying styles. Club or classroom training: a compact, allinone solution for teaching manual, paddle, semi automatic, and automatic key operations without extra equipment. Field or portable operations: a spacesaving controller that travels with your radio setup, enabling quick switching between key types and modes on location.