Key benefits 3.5 mm interface enables connection to standard telegraph gear; non3.5 mm devices can be used with a simple adapter or conversion cable. Portable practice setup that works with phones and computers, suitable for home, classroom, or travel, enhancing Morse code learning across different scenarios. Compatible with multiple operating systems including Windows; plugandplay trainer that requires no additional setup to start practicing. USB trainer with integration to VBand software available on the website; provides stable performance for both paddles and straight keys. Key features Interface: 3.5 mm connector allows connection to standard telegraph equipment; adapters or conversion cables can be used for other interfaces. Portability: designed for onthego practice; easy to connect to mobile devices and laptops. Compatibility: works with common operating systems, including Windows; hardware is plugandplay. USB trainer: connects via USB and integrates with VBand software for reliable operation with paddles and straight keys. Use scenarios Home practice: pair with a computer to study Morse code using preferred software and track progress. Classroom or group learning: shared use with students via compatible devices, enabling handson keying practice. Onthego training: connect to a smartphone or laptop during travel or field work to maintain skill development.