Meet the Twelve South AirFly Pro: a wireless audio transmitter and receiver for up to 2 AirPods and wireless headphones. You can easily connect it to your treadmill’s headphone jack to start listening through your AirPods. The battery life lasts over 16 hours. You can charge this device via USB-C.
The AirFly Pro comes with Bluetooth 5.0 connectivity and is optimized for shared listening. It has a range of up to 33ft. You can use it with devices that don’t have wireless streaming capability built-in.[where to get it]