EufyCam 2 Pro Volume Too Loud

I have just installed a eufyCam 2 Pro camera onto my system. When I try to talk to a visitor using the microphone on my iPhone 7, the volume is so loud on the camera that it totally distorts. This is on the medium level. When I switch to low, the volume is much to low. As there is no intermediate level, I am stymied.

Is there any way I can turn down the volume on the camera speaker so that it is useable?

BTW, I have no problems with the volume on my 2K battery doorbell.