1. Bluetooth 5.3. chip: JL 6925F 2. Battery capacity: 400mAh; charging time: about 2 hours 3. Use time: 12 hours (10 hours with lights on); standby time 120 hours 4. Size: 194*173*74mm; Weight: 184g 5. Support Bluetooth, AUX and other modes 5. Specially designed for children. The volume is limited to 85 decibels to protect children's ears; the earphones are lightweight and suitable for children to wear