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 defaults to 20V). 4: Supports reversible Type-C connector detection and automatic orientation recognition. This PD3.1 test device is designed for R&D, production testing, and burn-in of USB PD adapters and power banks. It supports PD3.1, PD3.0, PD2.0, and QC2.0 charging standards. Voltage selection is adjustable via DIP switch: 28V, 20V, 15V, 12V, 9V, and 5V. Each voltage setting has an indicator LED for clear visual confirmation. Factory default is 28V (automatically adjusts downward based on source capability). Input features a high-quality USB-C female port. Output uses a robust DC 5.5 x 2.5 mm male connector rated for high-current loads (up to 28V/5A). Includes solder pads for direct wire connection to external load. Rated for up to 140W continuous load capacity. Supports multiple charging protocols: 1: USB Power Delivery 3.1 2: USB Power Delivery 2.0 / 3.0 3: Adaptive Fast Charging (AFC) 4: Fast Charge Protocol (FCP) 5: Quick Charge 2.0 / 3.0 6: Automatic CC pin detection for reversible USB-C plug insertion 7: Protocol negotiation sequence: PD3.1 → PD3.0 → PD2.0 → QC → AFC → FCP Color: Black Material: PCB Package includes: 1 × PD3.1 test device