From the good people at InfoThink
The miniature Mjölnir comes with a micro-USB and full sized full-sized 2.1A USB port so you can charge your phone and/or tablet. It come in 2600mAh, 5200mAh, or 10,400mAh battery varieties(the largest needs a full ten hours to recharge and costs $125)
The hammer is equipped with LED's and sound effects to help you feel like the thunder god himself.