- The device supports vertical hand keys for vertical operation and horizontal left-right control of scan keys and mechanical semi-automatic keys. Other forms of manual electric keys are also integrated into one unit without compromising any manual electric key function. Whichever control method you use, this practice device helps you master it quickly. - With a Type-C interface, it can be powered from mobile phone chargers, laptops, power banks, and even computers. You are not tied to a single charging method and can use suitable power sources indoors or outdoors for various use scenarios. - Energy-saving and environmentally friendly: no batteries required. Practice sending messages. - Compact design and easy to carry. The circuit is simple, making it suitable for hand-key practice. - Use scenarios: train technicians to operate control panels that require vertical and horizontal keying; practice on-site in workshops or in vehicles using common USB-C power sources; run drills that involve issuing messages or commands using different key configurations.