TypeC power: USBC interface can be powered by mobile phone chargers, laptop adapters, power banks, or computers; suitable for indoors or outdoors, so you can use it any time, anywhere. Battery and energysaving: No batteries to install or ; efficient circuit designed for reliable, long practice sessions without maintenance. Compact and portable: Slim, lightweight design with a simple circuit focused on handkey practice; easy to carry and set up wherever needed. Flexible operation: Supports vertical handkey use and horizontal leftright scanning key operation, plus mechanical semiautomatic keys. One device covers multiple manual/electric key styles without extra gear; easy to master any method. Practical use scenarios: 1) Amateur radio training at home, at a club station, or in the field. 2) Morse code and keying practice for emergency drills or classroom lessons. 3) Demonstrations in electronics or radio workshops for students and hobbyists.