The sleek BT 4.0 version earbud which can pair with two devices simultaneously, this hands free device has volume control buttons on it with talk time of 3-4 hours and audio playback time of 3-4 hours. Charging time 2 hrs. Standby time 120 hours. Features: Bluetooth version of 4.0 Support Protocol: A2DP, AVRCP,HFP,HSP Impendance: 16O ± 15% Sensitivity: 104dB±3dB Frequency Response:20Hz-20KHz Rated Power: 2.5mW Max Power: 5mW Battery capacity:55mAh Certificates: CE, RoHs, FCC Price Includes: Free setups Free virtual proof Free Logo PMS matching Free 1C imprint on 1 side Free standard shipping to 1 continental US commercial location