This USB adapter by Delock can be connected to your USB interface, on the other side you can connect your USB device. The LED indicator of the adapter shows you the actual ampere and volt value of the connected device. - USB 2.0 type A male > - USB 2.0 type A female - 3 digits LED indicator - Automatical switching between Volt and Ampere display - For direct voltage 5 V - Max. 4 A