smallest device to stream music to my wireless headphones..?

[Qxx1]

hey everyone.. so just bought the wireless headphones (Sony mdr 1000x) to get rid of all the wires during my workout n other reasons.
But one more thing I want to get rid of
my phone! hanging in my pocket all the while. and I don't prefer using bands to hold on my phone.

so I'm looking for a smallest Bluetooth devise which can store my music n stream it without compromising the quality much..
like an ipod shuffle with Bluetooth would do..Any DIY for that (I do have a shuffle with dead battery 😛)

so any options here..

 

[Qxx1]

ipod nano 7th gen seems the only option..?