Multiple device charging: Charge multiple devices at once with this car charger featuring 30 ports and a generous 84 ft DC output cable for added convenience. Fast charging technology: Supports Quick Charge and Power Delivery protocols for optimized charging speeds; the robust 5W port provides up to 1W of power to quickly charge your devices. Realtime voltage monitoring: Stay informed about your vehicle's battery health with the integrated digital voltmeter that displays realtime voltage readings while you charge. Wide vehicle compatibility: Compatible with both 12V and 24V vehicles, making it suitable for various cars, trucks, RVs; the extended cable ensures easy access in any vehicle setup. Use scenarios Family road trips in a large SUV or minivan: Use the 30 ports to charge smartphones, tablets, cameras, and other travel devices for all passengers, with the 84 ft DC output cable providing flexible placement and reach. RVs or campers: Keep multiple devices powered while driving or parked, and monitor the vehicle battery with the digital voltmeter to ensure reliable operation on extended trips. Commercial fleets or work trucks: Provide charging for crew devices during long hauls, while the 12V/24V compatibility and extended cable offer versatile installation and access.