DUDAO U21-W In-earbuds TWS

BTversion: V5.4
Bluetooth solution: Jieli 7003D8
BT range: ≤10 meter
Frequency response: 20Hz~20KHz
Speaker type: Ф13mm@32ohm 
Earphone Battery Capacity: 30 mAh
Charging Case Battery Capacity: 300 mAh
Standby time: about 20 hours
Music time: about 4 hours (80% volume) 
Talk time: about  2 hours (80% volume)
Charging input : DC 5V / 1 A TYPE-C
Charging time: 
Charging case: about 2 hours 
Earphone charging: about  1.5 hours

1.ANC + ENC 
2. perfect sound quality
3. New BT 5.4 wireless chip, faster, more stable,Low latency