U-Air4

Ultra-long battery life
Bluetooth 5.1
Hall switch
Headset lithium protection
Battery protection plate Power indicator 1:1 in-ear comfort Binaural call Master-slave switching Real copper ring speaker Polymer pure cobalt battery Touch operation Life waterproof Charging stability Extra long life for charging your phone
Signal stability and anti-interference All-round testing
(Drop, salt spray, high and low temperature, plug test, etc.)
Full RF and audio detection
manually review
Certification: CE,FCC,ROHS,
Battery MSDS, BQB
ISQ900 European Union Appearance Patent