Waterproof: Water and dust resistance by a rubber USB cover, protects the internal circuit, effectively enhance its life | This Motorcycle USB Charger innovative on ON/OFF switch and three install options, features energy-saving and devices protection, prevent the battery from being drained. Three install options meet your different needs for installation. | The motorcycle power outlet comes with dual USB plugs, output 5V/2.4A & 5V/2.4A, lets you charge any two smartphones or tablet devices simultaneously, at top speed, such as iPhone, GPS, Camera, digital cameras, or any Smartphone or device that may be charged via USB. | Over-charge Protection: CE & ROHS certified, display the current detected by the intelligent circuitry while charging. Intelligent circuit design protects against excessive current, overheating, and overcharging. Ensure charging safety. | The SAE adapter has a built-in voltmeter. Monitories the battery and electrical system automatically and indicating the voltage in the screen, you will know the health of the battery while driving. Please pay attention when the voltage is under 12V. The upgraded display, with soft LED blue light without glare, would not interfere with your sight. It is also a very convenient way to tell you if the connection is successful.