Using your ODROID-XU4 as a Bluetooth A2DP Speaker or HFP Handsfree Unit With Your iPhone | ODROID Magazine
SANWU CIVIQ HF69B 6W+6W Dual Channel Stereo Bluetooth Speaker Amplifier Board DC 5V/3.7V Lithium Battery with Power Charging Management : Amazon.in: Electronics
KNACRO 2-Channel Bluetooth Amplifier Board 6W +6W Bluetooth Speaker Modified Board DC5V Power Supply Can Be Connected To 3.7V Lithium Battery-powered, With charge management circuit : Amazon.in: Electronics
SANWU HF41 TPA3116 bluetooth 5.0 2.1CH Amplifier 50W+50W Stereo 200W
Amazon.com: Wireless Earbuds Bluetooth Earbuds 5.2 Headphones,Noise Cancellation 30H Playtime Auto Pairing in-Ear Hi-Fi Stereo Sound Mic IPX7 Waterproof Headset for iPhone/Samsung/Android : Electronics