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Folks are using for practicing. I know that it is just a app that goes onto a device, and then it gives you decoding as well as the ability to directly connect straight or a keyer. Z-Dan has two different ways. There is a USB dongle that you can connect to your, to either a PC or iOS or Android device. It works directly through a web interface. It's got a little bit of a delay to it. It's got some way you can see that I find kind of annoying. It works with some kind of paddle. They also have a keyer that's not a keyer.