Groupon has the MiiKey MiiPower-2 5,200mAh USB Universal External Power Bank on sale for $17.99!

Why this deal is hot:
Save % off -- that's $ in savings!

What this does and why you need it:
Choose from black, gold silver or red for this 5,200mAh USB Power Bank. Charge up to two devices at once with this power bank that has enough battery life to charge an iPhone three times before depleting itself. It has an output at a rate of 1 or 2 amps, is lightweight and has an LED display showing the remaining charge left in the battery. It takes 6.5 hours to fully charge it, has a DC 5V/1A Input, DC5V/1A or DC5V/2A output, weighs 0.5 pounds and measures 3.5" x 2.4" x 0.6".