Features: The Morse 4KHeavy Duty TelegraphKey Practice Device with a 3.5mmaudiojack is the perfect tool for improving your telegraphy skills. Made of durable stainless steel, this device provides excellent tactile feedback. Designed for radio enthusiasts, telegraphoperators, and anyone looking to improve their Morse code proficiency. Whether you're practicing home, this device is portable, for both beginners and experts. With its high-quality construction and reliable, the Morse 4KHeavy Duty TelegraphKey Practice Device is a must for anyone serious about art of telegraphy. Specifications: Material: Stainless Steel Interface: 3.5mmAudioJack 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. Package includes: 1x CW TelegraphKey