1. Adopt Bluetooth 4.2 technology, strong signal, stable transmission, high-definition call. 2. Ergonomically crafted and comfortable to wear 3. Wireless Profile: A2DP1.3, HFP1.6, HSP1.2, AVRCP1.6, D11.3 4. Standby time:about 120 hours if one earbud on, 70 hours if both earbuds on 5. Continuous working time: 2-3 hours 6. Bluetooth version: Dual-mode V4.2, ultra low-power consumption 7. Frequency: 2.4GHz 8. Bluetooth Distance: 10m 9. Earphone: Internal 45mAh rechargeable li-ion battery 10. Box battery: 400mAh 11. Product siz: 63*40*32mm 12. Product weight: 52g (including the charging box)