How to transmit, receive, and log Bluetooth Low Energy beacons from Android devices via the nRF Connect app.
I consider having an FM radio in a Bluetooth speaker essential, as well as having SD card and 3.5mm input. The Simpowel V8 fulfills these needs for under $40.
Quick setup Bluetooth sound (speaker) on Linux PCs and embedded single-board computers, including the Intel Edison.
Setup and enable/disable Bluetooth on Linux devices
Detailed review of Soundbot SB240 and SB220 Bluetooth headphones–noting some problems with modern Bluetooth source devices.
Soundblaster Roar 2 FCC ID IBAMF8190 technical includes details of operation including apt-X.
Even $2 Bluetooth speakers can work OK. Better to get multipoint speaker for real investment.
How to force Bluetooth headphones to be recognized on Linux. Force Linux Bluetooth A2DP/HSP audio modes via pavucontrol.
Wifi and Bluetooth connections from legacy devices can make end users trackable.
How to disable built-in Bluetooth at bootup on Ubuntu 12.04.