These came with the Citizen CZ Smart watches but can be used to charge any USB port device. Great SOLAR renewable energy power sources! NOTE THAT THIS IS A MULTIPLE ITEM LISTING I had 6 for sale now 5 (I.E. YOU WILL GET ONE PER LISTED PRICE UPON PURCHASE) and all are NEW IN THE BOX. Jeweler friend of mine stock balanced some CZ watches and Citizen didn't want the power pads back.