Power Output: Check the power output of each USB port and the total output when both ports are in use. This information is usually measured in watts or amps. Compatibility: Ensure that the charger is compatible with your devices. Check for compatibility with various devices, including smartphones, tablets, and other USB-powered devices. Build Quality: Assess the build quality, materials used, and durability of the charger. Cable Quality: If the charger comes with a cable, check the cable quality, length, and connector types. Safety Features: Look for safety features such as over-current protection, over-voltage protection, and short-circuit protection to ensure the safe charging of your devices.