BiXPower 12V to 19V and 5V USB Mini Size High Efficiency 90W DC to DC Power Converter DD90M-19V This small size, light weight, high efficiency DC to DC power adapter can convert 12V (Range 9V ~ 17V) DC input power to 19v voltage DC output power. It also has a 5V USB port that can provide a maximum of up to 2.4A current, which is enough to charge and power an iPad. Accept wide range DC input voltage: from 9V to 17V; Maximum total output up to 90W. 5V USB port maximum output up to 2.4A; Super high converting efficiency: up to 96%. A regular DC converter efficiency is around 80% ~ 85%, which means 15% ~ 20% power will be used by converter itself. For a 85% efficiency rate power adapter to deliver 90W power, it will take 106W power from power source ( such as a battery). This DC Converter efficiency rate is up to 96%, which means only around 4% power will be used by converter itself. To deliver 90W power, it only needs 94W power from power source. Super small size: dimension is 2.5" x 1.9" x 0.7" ( 63.5*48.9*16.9mm). Super light weight: only 2.54 oz ( or 72g); Package comes with one BiXPower DD90M 90W Mini Size DC to DC Power Adapter and one 19V Output Cable