The iVoltaa car charger is a sturdy USB car charger. Ideal for almost any vehicle, once connected to the cigarette lighter port, you can simultaneously power two devices - including two tablets - thanks to the combined output. Featuring scratch-resistant coating, it will always look as new as the day you bought it. It delivers the optimal charge, making it the fastest, most effective way to power any connected device. With two ports, fast charging has never been easier. Constant charge the battery input of 12-24v is standard across all cars, however there are times when it can exceed this standard. When you hit the ignition switch or when the car accelerates, the input can be anywhere from 8v to as high as 30v. No matter the voltage, the USB charger will automatically adjust to protect your device and charge at a steady rate. Great power, great responsibility the car charger comes with a number of built-in protection methods to keep your device safe. The built-in over and under voltage, over-current and over-temperature protections ensure your mobile phone and other device's safety needs are guaranteed. Built-in safeguards protect your devices against excessive current, overheating and overcharging, this car charger is designed for high reliability and performance while protecting your smartphone battery cycle life. Universal compatibility: Samsung Galaxy S6, S7, Edge, Note, Nexus 6, HTC One M9, M8, Desire Eye, LG V10, G4, Moto, Sony, Asus and more and charge enabled devices: iPhone 7, 6S, 6 Plus, 5, 5S, SE, iPad Mini, Air, Pro (up to 5v, 2.4A). Note: This portable car charger adapter is offered with 1-year manufacture warranty.