When you want to connect an Airmar WeatherStation® Instrument to a PC and run Airmar's WeatherCaster™ software, a USB Converter provides a plug and play interface. The WeatherStation unit attaches to the Converter via a plug-in cable and a 1.8 m (6') USB lead, which then outputs data to the PC. The Converter also includes a 1.8 m (6') power cord for supplying 12 V power to the USB box and connected WeatherStation instrument.