Barrel jack 2.1/5.5 to micro USB adapter

For all DIY folks adapters are tools used daily and almost in every project. For what You can use this smal plug?
It is hard to find good, long USB cable - especially for power hungry devices. And 5V cables are easy to get, so… You take this plug, DC power extension cord, 5V power supply and that’s it! Power Your device even at distance of 5m!