Audible and Visual Indicators The buzzer sounds and blue LEDs light up in rhythm, providing simultaneous audio and visual cues. This helps beginners understand rhythm patterns and stay coordinated during practice or operation. Versatile Functionality This CW key controller can be used as a practice tool and as a controller. It supports vertical manual keys, horizontal paddle keys, and semi automatic mechanical keys, among others. It also supports all forms of automatic keys without compromising any functionality. Compact and Portable The CW key controller is small and portable. It does not take up much space during use, and wherever you can place a radio and a key, there is room for this device. No External Power Source The device does not require an external power source, reducing dependence on desk space and enabling easier placement in any setup. Use scenarios Home or classroom Morse practice: Beginners can leverage the audible buzzer and visual LED cues to learn rhythm patterns and timing while practicing Morse code. Multikey setup practice: For hobbyists or operators, the device works with vertical manual keys, horizontal paddle keys, semi automatic mechanical keys, and other automatic keys, allowing versatile practice and control without changing hardware. Portable field or spacelimited use: Its compact size and no external power requirement make it ideal for travel, clubs, or desks with limited space, where you need a readytouse key controller that fits alongside a radio.