Bluetooth 5.3; Chip: JLAC7006Battery capacity: 400mAh, charging for about 2 hoursUse time: 40 hours; standby 200 hoursSupport Bluetooth, AUX, TF card modeGood Sound Quality: W35 Air Bluetooth wireless headphone allows you to enjoy pure and wonderful sound quality quietly.Long Battery Life: With 400mAh large capacity battery, W35 Air can last up to 45 hours for calls or music.Bluetooth 5.3 Connection: Using Bluetooth 5.3 low power consumption chip, Hoco W35 Air headphone provides stable wireless connection Scalable.Ergonomic Design: Comes with an ergonomic design with automatic fit and fine-adjustment design as needed.The headphones are comfortable to wear without putting pressure on the ears.Retractable and rotatable design, closely matches the ear circumference, comfortable wearing