Ad: http://tinyurl.com/yc5atseu changed the earmuffs of the smallest size.After getting the headset, turn on the QCY-T in the Bluetooth list of the phone to match. Be sure to remove the headset from the headset box.T5 does not support connecting two phones at the same time, so if you want to change to a tablet or the like, you must first cancel the match on the phone. In short, turn off the Bluetooth of the phone.When wearing it, it is written in the inside of the earphone box whether it is the left or right earphone. Don't be confused when you wear it for the first time. I wore it wrong the first time.If you connect the phone for the first time and find that the sound is too low, you can reset it and connect it again.