The BSI w09 uses wireless charging technology and can be charged via a charging dock or a charger that supports the Qi wireless charging protocol. Before charging, make sure that the charging base or charger is properly connected. Put the headset into the charging base or close to the charger. The headset indicator light will turn red, indicating that it is charging. The headset can also be quickly charged through the charging dock or charger when the battery is low, and the charging time is about 1.5 hours. Do not place the earphones with metal objects during the charging process to avoid interfering with the charging effect.