Features.

1. Bluetooth 5.0, more stable and faster connection.
2. Fast seconds, Bluetooth 5.0, automatic seconds, with
    headphones can be used
3. Light, comfortable to wear, free to adjust, not easy to   
    fall
4. more enjoyment & longer;  3.5-4 working hours times
    per charge for earbuds, 5-6 times load full by charger
    sheath.
5. Suitable and Comfortable & wide compatibility. The tip   
    of the ear different sizes and in-canel cable-free
    design provides fit and comfort.  Supports devices that
    supports Bluetooth with version 4.0 and above.
6. Ready to exercise: sweat resistant with a safe fit
    made to move with you.

Specifications
Product number: TWS-L21
WirelessType: bluetooth
Wirelessheadsetversion: V5.0
Style: In-Ear
Waterproof: Yes
Communication distance: 10 meters (noobstacles)
Charging time: about 2 hours
Standby time: about 120 hours
Musictime: about 4 hours
Typeofbattery: Lithiumpolymerbattery
Support agreement: HEP / HSP / A2D / AVRCP
Headphonebatterycapacity: 3.7v50mAh
Chargeboxbatterycapacity: 3.7v300mAh
Function: for mobile phones, Hifiheadphone, for ipod
Chargingcaserechargeearphones: 5-6 times (bothearbuds)
Processmaterial: ABSsiliconeearcap
Size: about2mm * 16mm * 14mm / 0.08 * 0.63 * 0.55in
Filling caseize: about28mmx64mmx42mm / 1.10 * 2.52
* 1.65in
Color: black / white / pink
PackingList:
1 * Bluetooth earphone
1 * USB charging cable
1 * charging case
1 * user guide