Philips SHB9100 White Wireless Bluetooth Over-the-Head Stereo Headphone with Superior Bass & Optimum Clarity Sound-Isolating Super Soft Ear Cushions; Integrated Slim Headband Design Natural & Comfortable Fit from Deluxe Memory-Foam FloatingCushions Digital Enhancement Reveals Hidden Notes and Nuances; Bluetooth Stereo HSP / HFP / A2DP Compliant Volume, Track, and Toggle Control with Mic for Music & Calls; Choice of Wireless or Wired Listening Connector: 3.5mm; Sensitivity: 103 dB/mW, Input Impedance: 32 ohms, Frequency Response: 18-21,000 Hz, Driver Unit: 40mm