The characteristics of GaN (Gallium Nitride)-based PD (Power Delivery) 3.1 version can be summarized as follows:

1. Advanced Charging Technology: GaN PD 3.1 supports the USB PD3.1 fast-charging protocol, which features higher power output capabilities. Specifically, it can support up to 28V 5A charging, marking a significant advancement compared to its predecessors. This technology allows for faster charging speeds and greater efficiency.

2. High Efficiency: GaN-based chargers are known for their high efficiency, often exceeding 94% peak efficiency. This is due to the superior electrical properties of GaN material, which enables more efficient energy conversion and reduces energy loss during charging.

3. Smaller and More Compact Design: The adoption of GaN technology allows for the creation of smaller and more compact chargers. This is because GaN-based components can operate at higher frequencies and temperatures, enabling a reduction in the size and weight of the charger while maintaining high power output.

4. Backward Compatibility: GaN PD 3.1 chargers are backward compatible with previous versions of the USB PD standard, including PD 3.0. This ensures that they can be used with a wide range of devices that support USB PD charging, providing users with greater flexibility and convenience.

5. Enhanced Safety and Protection: GaN PD 3.1 chargers incorporate advanced safety features, such as overvoltage protection (OVP), overcurrent protection (OCP), overtemperature protection (OTP), and short-circuit protection (SCP). These features ensure that the charger operates safely and protects both the charger and the connected devices from damage.

6. Support for Multiple Devices: Many GaN PD 3.1 chargers come with multiple ports, allowing users to charge multiple devices simultaneously. This is particularly useful for individuals who need to charge multiple gadgets, such as smartphones, tablets, laptops, and more.

In summary, GaN PD 3.1 version offers advanced charging technology, high efficiency, a smaller and more compact design, backward compatibility, enhanced safety and protection, and support for multiple devices. These characteristics make GaN PD 3.1 chargers an ideal choice for individuals who demand fast, efficient, and safe charging solutions.