Comprehensive training tool: The DM901 Tone Key is designed for code enthusiasts, featuring sound output and key output to support effective learning and practice. Compact and portable: Size 130 x 66 x 44 mm and lightweight, easy to carry for practice anywhere. User friendly design: Built with a scientific and elegant European style; intuitive to operate for a smooth learning experience for all users. Use and applicability: Suitable for individual learners and for communication training collections; helps spark interest in coding in both children and adults. Key attributes: Function includes audio output and key output; compact dimensions; European style design; reliable performance that supports steady learning. Use scenarios: - Solo practice at home or on the go to reinforce coding concepts with immediate feedback. - Small group or classroom drills to improve communication and code related discussions. - Travel or break time practice to maintain progress.