Sony MDR1RBT Premium Bluetooth Over-the-Head Style Headphones (Black) Connectivity technology-wired/wireless; sound mode-stereo; connector plating-gold plated; earpiece-earpiece design-over-the-head; earpiece-earpiece sensitivity-105 db.; physical characteristics-color-black; Wireless technology-Bluetooth/NFC;impedance-24 ohm; features-tangle-free cable, detachable cord, noise cancelling; earpiece-earpiece type-binaural; microphone-integrated microphone-yes; physical characteristics-material-silicon; Cable length-3.94 ft;minimum frequency response-100 Hz; battery information-battery standby time-200 hour; earpiece-driver type-neodymium; interfaces/ports-host interface-mini-phone; physical characteristics-form factor-ear-cup;