Features: Experience unparalleled portability with our CW Morse Code Practice Board, making it companions for your desk or on the go practices. Power by a single CR2032 battery, this device eliminates the need for external power sources, offering convenience and extended usage time in various environment. Perfect for both beginners and Morse code enthusiasts, this practice board enhances learning and mastery through auditory and visual feedback, helping users refines their unique rhythm styles. Suitable for diverses setting, from home offices to adventure, its versatility design supports vertical hand key, horizontal paddles, and semiautomatic key, accommodating all manual keying method. The integrated green LED light synchronizes with the buzzers, providing a visual representation of your Morse code rhythm, transforming each practice into engaging and artistic experience Specifications: Component:PCB Size:Approx.60x30mm/2.36x1.18inch Package Includes: 1pc CW Practice Board (with CR2032 Battery) 1pc 6.35 to 3.5 Adapter note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.