- Bluetooth compliance : Bluetooth version 4.0. - Paired devices : Up to 8, connected to two at the same time (MultiUse). - Supported Bluetooth profiles: A2DP(v1.2), Hands Free Profile (v1.6), Headset profile(v1.2),Phone book access profile (v1.0). - Supported modes: EDR (2 and 3 Mb), SCO, eSCO, sniff mode. - Security: 128 bit encryption. - Operating range: when connected to mobile phone 10 meters (33 feet). When connected to USB dongle 30 meters (98 feet) range to PC. - Talk time: Up to 6 hours. - Standby time: Up to 10 days. - Charging time: Approximately 2 hours. - Wearing style: In-ear wearing style. - Weight: 7.9 g (0.28 oz) Headset only. - Dimensions, main unit : L 64.9mm x W 15.3mm x H 24.9mm. - Microphone: SLR = 14 dB +/- 3 dB 4 mm omni-directional microphone, 300-3.400 Hz. - Speaker: RLR = -2 dB +/- 3 dB 32 Ω. - Operating temperature: 10° C to 55° C (14 F to 131 F). - Storage temperature: 20° C to 70° C (-4 F to 158 F). - AC power supply: 100-240 V, 50-60 Hz. - Includes the nano sized Bluetooth dongle. - Has a 100' range. - Optimized for Skype.