How about a locksmith who always walks with useful for cell phones and tablets?
Looks like a key chain or a garage remote control, but it's actually a microUSB cable in disguise!
Once opened, we have a USB connector and microUSB for charging or data transfer.
The USB connector has a strange design, but worked normally.
The other side is a traditional microUSB connector.
I'm using as a locksmith from now, then I can check if they really will last. The wire is too small, but it can be useful in emergency to leave the cell by pressing close to the USB of a computer. Those interested I leave the link to the store Banggood:
http://www.banggood.com/Portable-Keychain-Design-Micro-USB-Charger-Cable-For-Tablet-p-78561.html