The seller answered my question and confirmed that the EJEAS Q7 intercom works with a standard wired phone headset/microphone. It uses a standard 3.5m long 4 section connector. My intercom app cannot use the provided microphone and headset speakers. I bought 2 pcs. Q7 and with the instructions which were good I was able to quickly turn on and pair the two devices. But the standard phone headsets/microphones didn't work. All I had was weird screams and noises and no microphone input. I've tried several wired headphone mics with the same result. The included mic and speakers worked, but not the standard wired headphones/phone mics promised by the seller.
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