BT v5.3, 400mAh battery for 12 hours of use, 120 hours of standby, 85dB sound limit, and support for BT, AUX, and other modes characterize these kids' wireless headphones. 1. BT version 5. 3. Chip: JL 6925F. 2. Battery capacity: 400 mAh; approximately two hours are needed for charging. 3. Twelve hours of use (10 hours with lights on). 120 hours is the standby time. The dimensions are 194*173*74 mm. 184g in weight. 5. BT, AUX, and other modes are supported. 5. Specifically made for kids. To protect children's ears, the volume is kept to 85 dB. lightweight and appropriate for kids to wear.