Smart connection compatible, regardless of the main and auxiliary ears, just pick up and connect. Bluetooth-compatible 5.1, driver unit stereo 10MM, wireless transmission distance is about 10 meters. Long endurance, music time is about 4 hours, standby time is about 100 hours. Charging time is about 1 hour, headset battery capacity is 30MAH, charging compartment battery capacity is 300MAH. Touch the button, adjust the volume, answer/hang up the phone hands-free, quickly cut the song, pause, play.