USB to 5V DC power cable powers a 5V DC device using your computer''s USB port instead of the device''s power supply. USB to DC adapter powers 5V DC devices through your PC or laptop''s USB-A port Avoid carrying bulky transformers in your laptop bag or blocking power strip outlets Polarity: positive tip, negative sleeve Recommended for devices with 3.5 x 1.35 mm barrel connector with positive center pin Features 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. Typical Applications Power an external hard drive via USB port or hub to avoid blocking outlets on your surge protector with a bulky transformer Connect a credit card reader to your laptop to ring up sales Charge your wireless speaker through your computer''s USB port instead of plugging it into a wall socket