High-Speed Dual USB 12V Car Charger with Quick Charge 3.0, Digital Voltmeter & Waterproof Design for Trucks, Motorcycles, Boats, Golf Carts - 36W Fast Charging Review

【INTELLIGENT DIGITAL VOLTMETER】The digital voltmeter allows you to know the voltage of the car battery in real time while driving, fully understand the health of the car battery, and make driving safer. 【DUAL QC3.0 USB PORTS】Dual QC3.0 USB charger adapter Fast Charging Charges 2 compatible devices simultaneously up to 4 times faster than conventional charging. Up to 38% more efficient than Quick Charge 2.0. The car charger socket is backwards compatible with Quick Charge 2.0 & 1.0. 【ON/OFF SWITCH】This USB car socket is designed with a on/off switch to save energy and protect your devices. Turn it on or off at any time to save power and prevent the car battery from being drained when not in use. 【WIDE COMPATIBILITY】The QC3.0 USB outlet fits for DC 12V-24V car truck motorcycle marine boat bus cart ATV RV etc. Suitable for charging most of portable devices such as phone tablets digital cameras, PDAs, PSP, MP3, MP4 and other USB devices. 【SAFE PROTECTION】The car charger adapter with the intelligent IC chip that provides over- voltage, over-load, over-heat, over-current, and short circuit protection. For USB car charging, the fast charging function only supports fast charging devices.