With its 2.1A rating you can charge two small devices at the same time or one large device.The West Marine Surface-Mount Dual USB Charger Socket is easy to install and offers compatibility with USB electronic devices that use a standard USB socket for charging. Its 2.1A rating allows charging two small devices simultaneously or one large device. Includes weatherproof cap to keep out dust and moisture when not in use.Maximum Output Current: 2.1ADC Input Voltage: 12V nominal; 9-16VDC Output Voltage: 5V DC +/- 5%Safety Features: Reverse polarity, short circuit and thermal overload protection