For VBand Morse Code CW Key Trainer Mobile Phone Computer Code Connector 1. This product is a carefully designed and produced Vband connector, suitable for vband websites and for use with VBand software. It has stable performance and is easy to carry. 2. This product is used with the website: https:hamradio.solutionsvband, and supports manual and automatic keys! 3. The key interface of this product is a 3.5mm diameter key interface. The key plug must be 3.5mm to use this product. Non-3.5mm key plugs require a simple conversion connector or conversion cable. 4. The vband website used by mobile phones requires buyers to prepare 0TG adapters or OTG cables. 5. Computer version: supports automatic identification of manual and automatic keys. The computer installs the practice software Lakey, the default manual key, and the key type is modified when using the automatic key. Click the button Manual in the middle of the software page to select the key. Put the cursor in the CW box to practice. The computer version can also be used on the vband website, but the setting options need to be modified. 6. Supports Windows, iOS, Android and HarmonyOS, plug and play.