This RadioMaster ELRS USB UART Firmware Flashing Dongle V2 is perfect for hobbyists and professionals looking to upgrade their ELRS receivers. It features an RM-CRSF JST-GH interface output for compatibility with ER series receivers, multiple protective circuits, and selectable output voltage. The spring-loaded pin socket and included DuPont wires make it easy to use. It comes with a 1.25mm Serial Port Cable - Type A, a 2.54mm Serial Port Cable - Type B, serial port test hooks, a Pogo Probe, a CRSF Wire, and a User Card.