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Experience superior sound, ultimate comfort and guaranteed reliability with the Optoma NuForce BE Free5. Cutting-edge audio technology, including graphene-coated dynamic drivers, AAC Bluetooth audio codec support and SpinFit eartips, come together for crisp, clear sound in a compact, ergonomic package with outstanding battery life. Connection type: Bluetooth Bluetooth type: V4.2 Bluetooth profile: HSP v1.2, HFP v1.6, A2DP v1.3, AVRCP v1.6 Codec: SBC, AAC Driver type: Dynamic Driver size: 5.6mm, Graphene diaphragm Impedance: 16 Ohm Battery life (estimated): Up to 4h + 12h with charging case Microphone sensitivity: -42 +/-3 dB Frequency response: 20Hz - 20kHz Sensitivity: 95dB +/-3dB at 1KHz Range: Up to 10m (33ft) Weight: Earphones 0.44oz, Charging case 2oz