Quiet Comfort 20 How to tell if my QC20 is for iPhone or Android?
My friend bought one for me but I can't find out if it's for iPhone or Android without the box (which I've thrown away with a pile of gift wrappers). How do I tell by looking or do I have to testing its functionalities by pluggin in?
I am asking because when I plug in the headphone to iPhone 7+ adapters (I tested with two different adapters), I immediately hear rhymstic clicking, sometimes set of beats, and sometimes with static. Sounds change whenever I switch apps. UNTIL I press and hold the volumn + or - button then the beats would disppear. Why is it happening? Is it because of the wrong device? Note that I never had this problem using it on multiple laptops or airplane.
Also how do I find the serial number to register this product?
So three questions here. Please help!