Donut  ture wireless bluetooth headphones

Bluetooth version:V5.3

Audio encoding protocols:SBC,AAC

Valid range:≥10m

Headset battery specifications:35mAh(protected board)

Earphone charging time:≈1.5H

The number of times the earbuds are charged:2.5times

Speaker size:Ф9mm

Horn impedance:320+15%

Frequency response range:20Hz~20KHz

Weight (single earphone):≈3.5g

Weight (set):≈34g

Charging case battery specifications:300mAh(protected board)

Charging time of the charging case:≈1.5H

Connect standby time:≈40H

Cumulative battery life:≈18H

Horn sensitivity:102± 3dB