HP In-Ear Music Headset with Removable Microphone, Dual Microphone design with one detachable option, 3.5mm Connection, Multi-Function smart controller to operate conveniently, 1-year Warranty - Interface: 3.5 mm the horn size: 4 ? 10 mm frequency range: 20 hz - 20 KHZ 5. Sensitivity: 103 db (at 1 KHZ) The output power: 10 mw The microphone: ? 4 mm Plug the microphone: ? 4 mm The frequency range: 100 hz - 16 KHZ Sensitivity:Signal to noise ratio: ?58dB

What's in the box
HP In-Ear MultiFunction Musical Earphones with Detachable Microphone