Fast Charging Protocols: Ensure the charger supports Power Delivery (PD) for iPhones and Adaptive Fast Charging / Super Fast Charging (PPS/AFC) for Samsung devices to get the fastest speeds.
Total Output (Wattage): Look for a charger with a high total wattage (e.g., 60W to 100W overall) so that charging multiple devices at once doesn't drastically slow them down.
Port Distribution: Check how many ports support high-speed output simultaneously (often one or two ports are designated for "super fast" charging while the others are standard speed).
Safety Features: Choose a model with built-in protection against overheating, overcurrent, and short-circuiting to protect your car's electrical system and your devices.