Touch Sensitive: The automatic telegraph key is touch-activated, featuring a standard 3.5mm output interface for stable performance and minimal interference. 2-Layer Design: The upper layer houses the main circuit and interface of the telegraph key, while the lower layer is a magnetic fixed base with a solid structure. Easy to Use: Users can perform all CW automatic transmission functions by touching the ball with two fingers, making it convenient and reliable. PCB Circuit: The telegraph key is printed with a PCB circuit, ensuring rust resistance, good stability, and convenience for outdoor use. Wide Application: The key can be easily attached to iron objects like radio casings and hoods without shifting, giving it a wide range of applications. Item Type: Automatic Telegraph Key Material: PCB Voltage: DC5V Output Interface: 3.5mm interface Working Environment: -40℃ to 85℃ 1 x Automatic Telegraph Key