1. High definition and fidelity sound quality. 2. Mini and easy to carry, ergonomic design, comfortable to wear. 3. Support automatic power-on pairing. 4. Compatible with iOS and Android systems, and supports calling voice assistants. 5. Bluetooth: V5.0 6. Ouput: DC 5V 7. Battery capacity: 350mAh (charging case) / 50mAh (headphone) 8. Working hours: about 5 hours 9. Charging time: 1 hours(headphone) 10. Support protocol: HSP / HFP / A2DP / AVRCP 11. Sensitivity: 120+/-5dB 12. Frequency range: 20-20KHz Packing list: - Headphones x 1 pair - Charging case x 1 - Charging cable x 1 - Manual x 1

http://olla.gr/l2-tws-stereo-bluetooth-5.0-wireless-earphone-with-charging-box-support-automatic-pairing-black/