? CSR: QCC3026 ? Master-slave control, touch operation ? Version 5.0, IPX5 ? Charging base 550mAh ? Earbuds each 40mAh ? Non-stop playing time: 3-4 hours ? Speaker: Φ7mm ? Impedance: 32Ω ? Sensitivity(SPK): 98±3dB@1KHz ? Earbuds size: 38.0*19.5*24.5mm ? Charing box size: 68.0*68.0*34.0mm