Premium Truly Wireless Earbud in Charging Case

An ergonomic and comfortable design for a truly wireless experience. Includes a built in microphone for hands free calling. 1. Bluetooth V4.2 2. Rated Power: 20mW 3. Working Distance Range: Approx. 10 M/ 33FT 4. Frequency Range: 2400-2480MHz 5. Charging Voltage: 5V 200 mA 6. Charging port: Micro USB 7. Battery Capacity: 55 mAh each earbud, 450 mAh charging box 8. Charging time: 1-2 hours for the earphone, 3-4 hours for the charging base 9. Playback time/Music time: Approx. 2.5 hours 10. Talk Time: 2.5 hours 11. Standby Time: Approx. 150 hours 12 .sensitivity:93dB 2dB 13. Hands free call with built-in superior HD microphone