Microchip AC164114, Chip Programming Adapter PIC18F1xK50 Programming Adapter for USB PIC Microcontroller

Designed to prevent damage to the USB PIC Microcontroller during programming
Limits voltage at the VPP pin to 8.9V
Prevents the voltage applied to D+/D- from exceeding 3.6V
Automatically protects USB data connections during the Program/Erase cycle (USB cable does not need to be unplugged from the USB host)