Little and how strongCar charger Y-P540 has 2 USB ports, each can charge 2.4A and its power is 24W. With all its power is extremely small, can be said tiny, because it hides completely into the connector of the lighter. It allows charging 2 devices simultaneously and is suitable for use in both cars and trucks (12 / 24V).IntelligentThe charger incorporates a special microprocessor (BC 1.2 standard) that intelligently controls the charge, adjusting the voltage, disconnecting the power when the device is fully charged, and many other aspects that extend the battery life and maintain their initial capacity. For safety by equipping the charger with a series of protections: before overloading, short-circuit and overheating. We can apply it to all USB powered devices.SecureUnitek has taken care of safety by equipping the charger with a number of protections: before overloading, short-circuit and overheating. We can apply it to all USB powered devices.