Model ：N21
Bluetooth ：V5.2
Use distance ：10m
Music time : ≈35hours （with charging box）
Stangby time : ≈55hours
Charging time :1 h

Instructions for use
Previous song: Double-click the left earphone
Next song: Double-click the right earphone
Play/pause: click any earphone
Volume +: 3 times left ear
Volume -: 3 times right ear
Summon siri: long press for 3 seconds
Answer a call: click once
Reject call: long press for 2 seconds