Audio-Technica M50X Wireless Bluetooth Headphone

45mm Diameter Drivers; Magnet: Rare Earth; Closed-Back Dynamic Type; CCAW Voiced Coil; Frequency Response: 15-28,000 Hz; Approx 40 Hours Battery Life; Sensitivty: 99 dB/mW; 38 ohms Impedance; DC3.7V Lithium Polymer Battery; Charging Time: 7 Hours (approx for 0-100%); Maximum Range: Line of Sight 10m (33"); Supported Codec: Qualcomm