We usually take turns charging our phones while driving, and I found this RAVPower® 24W 4.8A Dual USB Car Charger with iSmart Technology very useful. I was initially skeptical about charging 2 phones at once on a dual USB charger because I was afraid it might blow the fuse on the receptacle by drawing too much power to charge 2 phones at one time. I gave it a try because the specs indicate that there is a multiple safety system such as Temperature, Short-Circuit, Output over-current, and output over voltage.