The Relay 20,000 mAh Power bank has three USB ports with a max output of 5V/2.1A. This power bank contains a Grade A Lithium Ion battery that will keep your devices charged for days. Includes a USB to Micro USB connecting cable that can be used to charge the battery backup or be used to charge devices with a Micro USB input like Android smartphones from Samsung, Motorola, HTC, Nokia and others. This product is also available with a custom wrap for the packaging. See 7121-82 Relay Power Bank with Full Color WrapABS Plastic