Automatic Key Controller Compact Portable Easy to Use CW Practice Oscillator.This CW key controller is small, making it portable. It doesn't take up much space during use; wherever you can place a radio and key, there's room for this deviceThe setup is simple; when used as an exerciser, manual electric keys and automatic electric keys only need to be connected to their respective interfaces; when used as a key controller, the automatic key is connected to its corresponding interface while the radio connects to the output/manual key interfaceWhether used as an exerciser or controller not only will the buz sound but also blue LED lights will light up in rhythm providing both auditory and visual cues which are especially helpful for beginners in understanding rhythm patternsThe device is no need for an external power source and further reducing dependence on desk spaceThis controller can also be used as a practice tool supporting vertical manual keys, horizontal paddle keys and semi automatic mechanical keys among others. It supports all forms of automatic keys without compromising any functionalityHand key oscillator Automatic Key Controller. Oscillator Module CW Practice Oscillator. Automatic Key Exerciser Controller Training. Automatic Key Oscillator Key Practice Device. CW Key Controller Automatic Manual Key Training. [Audible and Visual Indicators]: Whether used as an exerciser or controller not only will the buz sound but also blue LED lights will light up in rhythm providing both auditory and visual cues which are especially helpful for beginners in understanding rhythm patterns [Easy to Use]: The setup is simple; when used as an exerciser, manual electric keys and automatic electric keys only need to be connected to their respective interfaces; when used as a key controller, the automatic key is connected to its corresponding interface while the radio connects to the output/manual key interface [No Need External Power Source]: The device is no need for an external power source and further reducing dependence on desk space [Compact and Portable]: This CW key controller is small, making it portable. It doesn't take up much space during use; wherever you can place a radio and key, there's room for this device [Versatile Functionality]: This controller can also be used as a practice tool supporting vertical manual keys, horizontal paddle keys and semi automatic mechanical keys among others. It supports all forms of automatic keys without compromising any functionality