This is an update of the original Winkeyer kit that was introduced several years ago and is now back by popular demand. It attaches to a serial port on your PC and does not require a battery or external power source. This makes it very convenient to hook up. The operating current is so low that it can run off the modem control lines of your serial port. These keyers are still finding a place on PCs that do not have USB ports or for remote applications on a network link.
This kit uses a special version of the WinKeyer2 v23 controller which provides direct paddle inputs and true dual keying port capability. WK Serial runs at 3.3V, which means it will work at a very low RS232 voltage swing like you would find on a laptop PC.