It's hard to rate this as anything but optimal as it does exactly what it's supposed to do: add Bluetooth capability to non-Bluetooth music devices. I specifically chose this brand as it is the same brand as the sound system I connected it to. One warning: IKEA-style instructions (although how difficult can that be?).
KLIM CD Boombox Portable Audio Player with FM Radio, Rechargeable Battery, Bluetooth, MP3, AUX, Neodymium Speakers, and Upgraded CD Laser Lens (2021 Edition)
11 Review
AUNA Connect 150 Black 2.1 Wi-Fi Internet Radio Music Player With MP3 USB Port, AUX & Remote Control - Black
16 Review
Sangean PR-D4W Portable Weather Alert Radio with AM/FM Bandwidth Narrowing and Auto Tracking for Improved Searchability
12 Review
Radio receiver Max MR-322 anthracite
14 Review