Charge Qi Enabled Devices Wirelessly By Placing Compatible Device On Top Of Charging Pad | Expand Available USB Ports On Your Computer For Additional Peripherals (Mouse, Keyboard, Printer, Etc.) | Wireless Charging Feature May Not Function With Older USB Ports. Requires Newer USB Ports With Increased Output Capacity (1.5A) For Charging. | Not For Use With A/C Adapters (Wall) Or D/C Adapters (Vehicle) | 2 High Speed USB Ports | Cord Attached And Stored Within | Output: 5 Volts/1 Amp | Charges Most Phones, MP3 Players And More! . Approximate Size: 2 1/2″ Diameter.., Imprint Area: 1 1/4″ Diameter.