1: Connect a PD power supply to set the output voltage via the DIP switch. 2: Supports online hot-swap voltage selection and fixed voltage modes. 3: Supports backward compatibility with voltage ranges (e.g., if set to 28V but the charger’s maximum is 20V, it will negotiate at 20V). 4: Supports plug orientation detection and automatic Type-C connection handling. This PD3.1 test device is designed for R&D, production testing, and burn-in of PD adapters and USB PD power banks. It supports PD3.1, PD3.0, PD2.0, and QC2.0 charging protocols. Voltage selection is made via DIP switch: 28V, 20V, 15V, 12V, 9V, and 5V. Each voltage has an indicator LED for clear status visibility and automatic negotiation of the highest supported PD voltage. Factory default is 28V (if the connected charger supports only up to 20V, negotiation defaults to 20V). Input uses a high-conductivity Type-C female connector. Output load interface is a high-current DC 5.5 × 2.5 mm male connector. A solder pad is included for direct wire connection to the load. Designed for high-power applications up to 28V/5A (140W). Supports multiple fast charging protocols: 1: PD3.1 2: PD2.0 / PD3.0 3: AFC 4: FCP 5: QC2.0 / QC3.0 6: Automatic CC pin detection for reversible Type-C insertion 7: Automatic protocol negotiation in sequence: PD3.1 → PD3.0 → PD2.0 → QC → AFC → FCP Color: Black Material: PCB Package Includes: 1 × PD3.1 test device