ESC-Link is a USB programmer for setting up ESCs with BlHeli_S, BlHeli_32 and AM32 firmware via a computer with the BlHeli Suite configurator. You plug the classic servo connector from the ESC into the programmer, connect the battery to the ESC and plug it into the USB. In BlHeli Suite you select the USB/Com interface and you can set up the ESC without the flight controller. This makes the USB Programmer especially suitable for pilots of fixed wings.