Bluetooth earphone（VD-BT021）

1.Bluetooth Version:V5.4,

2.chip: JL6983D2

3.Bluetooth Protocol: HFP、A2DP、HID、AVRCP、AVCTP、AVDTP，

4.Transmission Distance:10m,

5.Call Duration:3.2hours,

6.Music Playtime:4 hours,

7.Standby time：50 hours，

8.Battery Capacity:25mah/ 300Mah，

9.Charging time：   1.5 hours，

10.Speaker:Φ13, composite membrane，

11.Speaker Sensitivity: -86dBm，

12.Frequency Response:100Hz-20KHz,Imitate the appearance of Apple earphones（ charging case+earphones）