Open Ear Bluetooth Headset Air Conduction Headphones Wireless Earphones Sports

Description.
100% brand new and high quality

Features.
Net weight: 28g
Main Parameters:
Model No.: K9 Bluetooth headset (silicon microphone HD call effect)
Bluetooth programme: Bluetooth V5.3
Product speaker: 16 speakers (bass effect is obvious) standby time: 800 hours
Working time: 8 hours
Charging time: about 1 hour
Communication distance: barrier-free 10-15 metres
Headset battery capacity: 90 mAh (pure cobalt battery)
Frequency: 20Hz-20KHz
Impedance : 32 ohms
Sensitivity ： 85dB/mW
Waterproof rating ： IPX 4