Features: Elevates your CW keying skills with our USB Key Trainer, for seamlessly integration with the VBand software on website, ensuring stable performances for both paddles and straight key. Featuring a universal 3.5mm interfaces, this CW keyer interfaces caters to all standard telegraph key; non3.5mm key can be easily connecting with a simple adapter or conversion cable. Suitable for amateur radio enthusiasts and Morse code learners, this device supports automatic and manual key recognition, making it suitable for users. Whether you're practicing home, in a classroom, or on the go, our portable CW practice interfaces connecting effortlessly to phones and computers, enhancing your learning experience across various scenario. Compatibility with multiple operating systems including Window, this plugs and play CW trainer is a tool for anyone look to improve their Morse code proficiency without the need for additional setups. Specifications: Component:PCB Size:Approx.44x20x7mm/1.73x0.79x0.28inch Option Type:USB Key Trainer for CW Key;USB Key Trainer for Vband; Compatibility with Window Systems Package Includes: 1pc USB Key Trainer 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.