Bluetooth Transmitter/Receiver 2-in-1 3.5mm Audio Adapter

Buy offer Details

I'm looking for products with the following specifications :
1, You must be able to charge and use the Adapt at the same time. This is important for people who will leave it plugged in to their home stereo or car aux system.
2, The Adapt must have a good quality microphone (with noise reduction), since it usually takes over the BT device's microphone.
If it allows the user to use the wired device's microphone that would be a big bonus. I don't know if that would happen.
3, The on/off button and the pairing button shouldn't be easily confused. With our current version, people constantly un-pair their Adapt when they turn the Adapt on. (They hold the MFB button down too long and re-activate pairing).