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Built-in Microphone HD Audio Interaural Stereo Membrane Vibrating Technology Built-in rechargeable 50mAh Lion Battery Clear base resonance, noise reduction, and superior sound isolation Wide compatible with the various devices with Bluetooth function for android mobile phone and for Iphone. Specifications Bluetooth 2.1 Frequency Range 2.4GHz-2.48GHz Operating Distance up to 10m (free space) Bluetooth Profiles: A2DP, AVRCP, HSP, HFP Standby Time up to 120 hours Talk/Music Playtime: Approximately 3-4 hours Charging Time: 2 hours Frequency Response: 20Hz-20kHz Operational temperature: -10 to 50® C
