Dual-port QC3.0 fast charging: The dual-port outputs a total of 36W. The USB car charger adapter can quickly charge two devices at the same time at QC3.0 speed, charging from 0 to 80% in 30 minutes; providing 6 times faster charging speed for compatible devices. PLEASE NOTE: iphone does not support QC3.0, however, this fast car charger adapter can also fast charge iphone. Minimal size, flush design: Small thumb size (dimensions: 36mm*50mm) body, QC 3.0 fast car USB charger fast charging integrates perfectly with most car charger cigarette lighters and sits comfortably on the edge of the socket. It's portable and you can take it anywhere. Full metal body and won't heat up: The upgraded metal cigarette lighter USB car charger won't burn out and is safer than plastic. Through a number of safety certifications, the dual-port fast-charging USB charger has multiple overcurrent and overcharge protections to ensure the safety of your equipment. There are various protection functions: input overvoltage, undervoltage protection; output overcurrent, overvoltage, undervoltage, short circuit protection; reverse connection protection; intelligent chip internal high temperature protection. With independent switch button, LED voltage light display, dual USB interface, fast charge QC 3.013. Waterproof grade: IP66.