【Compact】Unparalleled portability with the Morse Code Practice Oscillators,smaller and thin,making it compatible with any enthusiasts toolkit or pocket 【Easy Installation and Removal】Equipped with TYPE C interfaces,this device can power by various sources like phone charging,laptop adapters,power sources,or computers,ensuring seamlessly operations in any environment. 【Easy to Use】compatible with both beginners and ,this practice oscillators aid in masterings Morse code rhythm through auditory and visual,enhancing learning and correcting techniques errors. 【Usage】compatible with use in diverses setting,whether indoors or outdoors,this device fit efcompatible withtlessly into any space where a Morse key is used,offering flexibility and convenience. 【Application】The Morse Trainer supports vertical,horizontal,and semi Automatic key,accommodating all manual Morse key without compromises,making it essential tool compatible with anyone passionate about communication. Specification: Material: PCB Size Chart: 3.5cmx1.7cm/1.38inchx0.67inch Package Includes: 1 Small Morse USB C Key Trainer Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.