LED VOLTAGE DISPLAY: This SAE adapter has a built-in voltmeter. Detect and display the voltage when power is on. It is also a very convenient way to tell you if the connection is successful. WIDE COMPATIBILITY: The SAE to USB adapter is designed for use on any 9-24 volt battery, and is used to charge any , GPS, Camera, digital cameras, or any Smartphone or device that may be via USB. POWERFUL CAPACITY: With dual USB plugs, output 5V/2.1A & 5V/2.1A. This motorcycle charger lets you charge any two smartphones or tablet devices simultaneously, at top speed. OVER-CHARGE PROTECTION: display the current detected by the intelligent circuitry while charging. Intelligent circuit design protects against excessive current, overheating, and overcharging. the charging safety. WATERPROOF DESIGN: Cable length: 1M (40 Inches). Water and dust resistance by a rubber USB cover, protects internal circuit, effectively enhance its lifespan Input Voltage: 9V-24V Output Voltage: 5V Output Current: 2.1A &