The microphones of AA-ER1 and AA-ER2 can only be used in one situation: 1. The headset is in Bluetooth mode. 2. The headset is currently in a call. The microphone can only be used in the above two conditions are met at the same time. AA-ER1 and AA-ER2, as head-mounted music headphones, have better sound quality than TWS headphones at the same price.