Vband Trainer CW Key Trainer PC+Vband Morse Code Trainer USB Code Trainer Telegraph Trainer Key Connection 1. This trainer has two working modes. It can be used for CW training on computers and mobile phones. It is suitable for systems and is plug-and-play without drivers. If you need to use this trainer on a mobile phone, you need to prepare an OTG adapter or OTG adapter cable._x000D_ 2. USB interface: It can be directly connected to a computer or a mobile phone through an OTG device._x000D_ 3. Electric key interface: It can directly connect to the hand key and the automatic key. To connect the hand key, you need to connect the hand key first and then connect the mobile phone or computer. This device intelligently identify the hand key or automatic key._x000D_ 4. Button: Used to switch between mode one and mode two. and hold this button to connect a computer or mobile phone to switch between the two modes. In mode one, this button can move the mouse mark. This function is especially important on mobile phones. and hold this button to move the mouse mark downward. Move to the bottom of the mobile phone screen and continue to and hold this button. The mouse mark move upward from the bottom._x000D_ 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_x000D_ Specification:USB interface_x000D_ Colour:Green_x000D_ Material:Plastic Package Contents:_x000D_ 1 * CW Key Trainer Only the above package content, other products are not included._x000D_ Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_