Yesido EP06 Children Over-Ear Bluetooth Headphones1. Material: ABS plastic + hardware bracket + PU leather earmuffs2. Bluetooth version: Jerry AC6955F V5.33. Bluetooth chip: JL7006F4. Transmission range: 10m5. Memory card playback format: MP3 WAV WMA, maximum 32GB, format FAT FAT326. Play time: 20 hours (lights off) 12 hours (lights on)7. Built-in lithium battery: DC 3.7 V DC 400mAh8. Speaker impedance: 32Ohm9. Charging time: about 2H10. Speaker size: 40mm neodymium ferromagnetic speaker11. Microphone sensitivity: -42+-2dB12. Ergonomic design, no pressure on the ears or stuffiness when worn for a long time13. Using Bluetooth 5.3 chip, high-speed and stable transmission over a distance of 10m, no lag during use, low latency, and audio and video synchronization