1. Improve your Morse code skills with the VBand Morse Code Trainer, a versatile device that seamlessly connects to your phone and computer. Perfect for both amateurs and professionals, this compact and efficient trainer offers a user-friendly interface and rugged construction to ensure reliable use 2. Typec interface: can be connected to a computer via a mobile phone power cable, or to a mobile phone via a dual Typec interface data cable. This trainer has built-in OTG circuit, so no OUG conversion is required 3. Key interface: can directly connect hand keys and automatic keys. To connect a hand key, you need to connect the hand key first and then connect the phone or computer. This device will intelligently identify the hand key or automatic key 4. Button: Switch between mode 1 and mode 2. Press and hold this button to connect a computer or phone to switch between the two modes. In mode 1, this button can move the mouse logo, which is especially important on mobile phones. Press and hold this button to move the mouse logo downward. Move to the bottom of the phone screen and continue to press and hold this button, and the mouse logo will move upward from the bottom 5. Indicator light: Indicates the working status of the two states. The indicator light is always on, which is mode 1, suitable for training software or APP operated by mouse, such as for Lakey, Cwplayer, MorseTrainer, etc. The indicator light flashes, which is mode 2, suitable for some special training software or APP, such as for Vband website, MorseMania, MorseIt, etc Name:CW Key Trainer Specification:Type-c interface Colour:Green Material:Plastic Package Contents: 2 x CW Key Trainer