1. Earphones can be plugged in, real-time monitoring by ear return 2. Preferred ABS material, safe, environmentally friendly and durable 3. Round and no burrs, no damage to small hands 4. Karaoke time: 480 minutes 5. It is both a microphone and a desktop audio 6. Bluetooth protocol: 5.0 7. Signal to noise ratio: greater than or equal to 100db 8. Operating distance: 10 meters 9. Frequency response range: 20-20000HZ 10. Charging time: about 1.5 hours 11. Playing time: about 7 hours 12. Power supply mode: USB/built-in lithium battery 13. Battery capacity: 1800 mA 14. Packing list: microphone + manual + charging cable + packing box 15. Standard version: wireless Bluetooth version, smart beaut, deep noise reduction, compact and easy to operate 16. Ultimate version: AI wireless Bluetooth version, AI smart song, deep noise reduction, compact and easy to operate