U99

Bluetooth 5.3
Ultra-long battery life
Digital display of electric quantity
master-slave switching
Polymer Battery Touch Operation Life Waterproof Charging Stability
Real Brass Ring Horn
1:1 in-ear comfort 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