Review on DaierTek USB Rocker Switch: Waterproof Car Charger with LED Voltmeter & Dual USB Adapter - Ideal for Rocker Marine Panel, Boat, RV, Vehicle by Keith Morris

My first review was after installation but before attempting to charge a mobile phone. I can't measure the power output, but I can tell you that in the same car with a similar 2 amp charge rate, a device plugged into my cigarette charger port will charge at least twice as fast, if not three times as fast. With the same charging cable. The principle of this device is simply fantastic! But equal charging capabilities would put this device ahead of traditional car chargers.