Amazon link to Sony SRSXP700 https://amzn.to/3AvMEm3
I'll cover my top 5 advantages the XP700 has over the PB310 and if that makes the Sony a worthy alternative to the hard to find PB310.

Wait For Me Jeff The Second • Jeff The Second ...
Creative Commons Attribution
Free Download / Stream: https://bit.ly/3LLKFj0
Music promoted by Audio Library • Wait For Me – Jef...
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Track Info:

Title: Wait For Me by Jeff The Second
Genre and Mood: Rock + Bright

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Available on:

Spotify: https://spoti.fi/32oSR2d
iTunes: https://apple.co/2SXMRKz
Deezer: https://deezer.com/us/album/133122222
YouTube: • Jeff The Second ...
Google Play: http://bit.ly/380gLC2

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Contact the Artist:

/ @jeffii
https://open.spotify.com/artist/0ej2b...
  / artist  .
https://play.google.com/store/music/a...
https://deezer.com/us/artist/61996262
  / jeff2music  
  / jeff2music  
https://paypal.com/donate/?token=ouOZ...

Play Easy by tubebackr   / tubebackr  
Creative Commons — AttributionNoDerivs 3.0 Unported — CC BYND 3.0
Free Download / Stream: https://bit.ly/3wJkHUG
Music promoted by Audio Library • Play Easy – tubeb...
––––––––––––––––––––––––––––––

Track Info:

Title: Play Easy by tubebackr
Genre and Mood: Dance & Electronic + Bright

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Available on:

Spotify: https://spoti.fi/3vHxg2S
iTunes: https://apple.co/3fCQ91b
YouTube: • Play Easy tubeb...
SoundCloud:   / play.  .
YouTube Music: • Play Easy tubeb...

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Contact the Artist:

tubebackr:
  / tubebackr  
/ @tubebackr
https://open.spotify.com/artist/1NXfZ...
  / artist  .
https://tubebackr1.bandcamp.com
  / tubebackr_music  

Track Info:
Take Me As I Am by Sunchaser (2016)
Spotify: https://open.spotify.com/track/4PJFaC...
Shazam: https://www.shazam.com/track/31142370...
Deezer: https://www.deezer.com/us/track/11859...
MusicApple:   / sunchaser