Features: Experience Morse code transmission with the Double Paddle Automatic Key, featuring a base and paddles for smooth operate, ideal for shortwave radio enthusiasts. This compact key offer adjustable contact gaps via knurled screws, magnetic damping for bilateral tuning, and a 3.5mm interfaces, all housed in a sturdy design with anti skid feet for stable telegraph training. Designed for radio operators and amateur radio hobbyists, it provides precise control and durability for Morse code practice and communication activities. Use it in portable field setups, home radio stations, or training for seamless shortwave radio operations, thanks to its lightweight yet robust construction and easy to adjust features. Enhances your telegraph key experience with its ergonomic paddles and rear contact structure, ensuring consistent performances and comfort during extended Morse code keying. Specifications: Component: Aluminum Alloy Interfaces: 3.5mm Color: 3 Color Optional Size:about. 127x60x45mm/5x2.36x1.77in Package Includes: 1pc Telegraph Training Key note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.