Miniature USB C Morse Key Trainer with Sound and Light Compact portable trainer for practicing and refining Morse code skills. Small and thin design fits easily in a toolkit or pocket while delivering clear audio and visual feedback to help users learn correct rhythm and timing. Key benefits Portable and convenient: At approximately 35 x 17 mm (1.38 x 0.67 inch), this trainer is easy to carry and store, suitable for field use, classroom work, or hobbyist kits. Clear audio and visual feedback: Builtin sound and light indicators make it easier to internalize dot and dash timing and to spot timing errors during practice. Broad compatibility: USB C power input works with phone chargers, laptop adapters, power banks, and computers for reliable operation in varied environments. Supports common key types: Compatible with vertical, horizontal, and semiautomatic keys, accommodating a wide range of manual Morse keys without modification. Useful for learners and experienced operators: Designed to help beginners develop correct rhythm and to let experienced users maintain or test their technique. Features Power: USB C interface for flexible powering options from common USB C sources. Feedback: Simultaneous audible and visual signals to reinforce correct Morse timing. Form factor: Ultracompact size for easy integration into any practice setup. Compatibility: Works with manual Morse keys in vertical, horizontal, and semiautomatic configurations. Practical use scenarios Field practice: Use with a small key at outdoor events or portable stations to practice sending with immediate sound and light feedback. Classroom or workshop training: Provide students with a simple trainer to learn rhythm and timing before moving to full equipment. Home practice and maintenance: Quick, compact tool for hobbyists to warm up, test keys, or refine technique without setting up larger equipment. Specifications Size: Approx. 35 x 17 mm (1.38 x 0.67 inch) Interface: USB C power input Package includes: 1 pc USB C Key Trainer Notes Allow up to 1 mm error due to manual measurement. Actual product color may vary slightly from photos depending on monitor settings.