Features: 1.TOUCH SENSITIVE: Auto telegraph key is touch type, standard 3.5mm output interface, stable performance and less interference. 2.2 LAYER DESIGN: The upper layer is the main circuit and interface of telegraph key, and the lower layer is the magnet fixed base with solid structure. 3.EASY TO OPERATE: Users can realize all functions of CW automatic shooting with two fingers touching the ball, which is convenient and reliable. 4.PCB CIRCUIT: Telegraph key is printed with PCB circuit, rust resistant, good stability and convenient for outdoor use. 5.WIDE APPLICATION: The key can be easily attached to iron objects such as radio shells and car hoods without moving, so it has a wide range of applications. specification:Item Type: Automatic Telegraph Key Material: PCB Voltage: DC5V Output Interface: 3.5mm Interface Working Environment: -40 to 85 PackageList:1 x AutomaticTelegraphKey