Looks like quality connectors and overall reliability. I won't know for sure until I use it for a long time, so it's mostly about the looks. In terms of sound quality, I don't think anyone can notice a difference while it's running. I use it to extend the temperature sensor and the readings are the same with or without the signal going through that wire.
SINGING WOOD Boombox Portable Bluetooth
9 Review
KEiiD Bluetooth Stereo Shelf System With Retro CD Player, Speakers, FM Radio Receiver, USB, AUX, Bass/Treble EQ, Wooden CD Music Bookshelf System For Home Audio
28 Review
Experience Ultimate Music Enjoyment with Sony CD Boombox ZSPS50B.CED - USB Playback & Audio Input Included!
13 Review
Gamepad GEN GAME X3 Bluetooth, black/red
23 Review