This is a 9V fixed-voltage MyVolts-branded power supply adaptor designed to meet exactly the power specification of your Line 6 POD HD500X Multi-effects.
Great low cost alternative to the OEM power supply
Satisfied customer here. The power supply works just as well as the OEM power supply. I play a lot at church, and sometimes forget my power supply at home or leave it at church, so I bought a backup to always have in my bag. This is a good buy if you're looking for a low cost alternative to the OEM power supply. I'll come back for similar needs in the future when I don't want to spend $50-70 on replacement OEM parts.
It's just a 9v plug with an adapter that plugs in as a third party. The power supply itself doesn't actually fit the POD and the adapter causes awful feedback in the output