<https://www.handheldaudio.co.uk/shop/shure-se846-quad-driver-professional-sound-isolating-earphones/#product>
<http://schema.org/description>
"Top of the line listening experience\r\n \tCustomiseable sound via interchangeable filters\r\n \tFrequency Response: 15Hz - 20KHz\r\n \tImpedance: 9 ohms\r\n \tBluetooth 4.1 connectivity with supplied cable\r\n \tMicro USB charging cable\r\n \tStandard 3.5mm minijack cable with inline mic\r\n \tFit Kit has premium foams and flex tips\r\n \tRoad case and stylish carry case included\r\n \tTwo year manufacturers warranty"
<https://www.handheldaudio.co.uk/shop/shure-se846-quad-driver-professional-sound-isolating-earphones/>