W39 Cat ear wireless headphones for kids, BT v5.3, 400mAh battery for 12 hours use, 120 hours of standby, 85dB sound limit, supports BT, AUX and other modes 1. BT v5.3. Chip: JL 6925F. 2. Battery capacity: 400mAh, charging time is about 2 hours. 3. Use time: 12 hours (10 hours with lights on). Standby time 120 hours. 4. Sizes: 194*173*74mm. Weight: 184g. 5. Supports BT, AUX and other modes. 5. Specially designed for children. The volume is limited to 85 decibels to protect children’s ears. Lightweight, suitable for children to wear.