Amazon.com: Muswor Bluetooth Receiver Adapter Wireless Converter for Bose QuietComfort 3 (QC3) Headphones ( Not Compatible with any others ), Built-in Headphone Amplifier : Electronics
Airfrex Wireless Bluetooth Adapter Compatible with Bose QC3 ( QuietComfort 3 ) Headphone : Electronics - Amazon.com
Converting a Jabra Clipper into a Bose QC3 Bluetooth module
For BOSE QC3 Headphone Bluetooth V4.1 Wireless Adapter Transform non Bluetooth Headphone into Wireless for iPhone xiaomi Samsung|Earphone Accessories| - AliExpress
Amazon.com: Muswor Bluetooth Receiver Adapter Wireless Converter for Bose QuietComfort 3 (QC3) Headphones ( Not Compatible with any others ), Built-in Headphone Amplifier : Electronics