B4 RGB Cartoon Stereo Headset Wireless Bluetooth Headphones 1. Bluetooth 5.1: Simple pairing and stable connection. Let your kids enjoy wireless music without worrying about tangled cables. 2. Use the included audio cable to connect the earphones to your device, you can still enjoy the music, even if the earphones have no power, the bluetooth mode will be turned off when the audio cable is plugged in. 3. Wireless Hands-Free Calling: Keep your kids on the phone with you when the headset is on, and is also an ideal online learning tool. 4. Rechargeable - built-in 400mAh: about 3 hours of charging can support about 8-20 hours of continuous playback. If the bluetooth mode is low on power, you can use the auxiliary cable to enjoy the wired mode. 5. Independent buttons: multi-button design, you can easily switch music, adjust the volume, and freely control playpause. 6. Adjustable hair band: Hair band with soft cushion and pressure relief ear pads, suitable for people of different ages. 7. Lightweight and comfortable: Even if the child wears it for a long time, it will not feel pressure. 8. Foldable and Portable Design: Foldable headband, compact design fits perfectly in your backpack. Product Specifications: 1. Bluetooth version: V5.1 2. Bluetooth distance: 15m (no interference) 3. Interface: Type C 4. Turn on the light and use time: about 8 hours 5. Turn off the lights and use time: about 20 hours 6. Horn size: 40mm in diameter 7. Impedance: 32Ω 8. Battery capacity: 400 mah 9. Product type: cat, squirrel, bear packing list: Headphone X1 Audio cable X1, Charging cable X1 Chinese and English manual X1