USB to DC Adapter Charges 5V DC Peripherals via USB Port Now you can power up your external 5V DC devices without having to carry around a bulky DC transformer or find room for it in your surge protector or power strip. This USB to 5V DC power cable connects to your computer or laptop’s USB-A port to provide power to operate your device. You can also connect your device to a USB wall charger or car charger. It’s recommended for powering devices with a 3.5 x 1.35 millimeter 5V DC barrel jack, such as external hard drives, wireless routers, Bluetooth speakers and credit card readers. Lifetime Warranty The U152-003-3P5 is backed by a lifetime warranty, ensuring reliability and performance.