Stop fighting with cheap earphones that could not last long and is of mediocre sound quality. Get his F1 earphone that is durable and of great sound quality and we are offering discounted price to promote sales!CloudStep F1 earphone is of great sound quality and well made. The sound is rich and robust.RICH AND ROBUST SOUND: With average performance for bass， F1 Stereo Earphone by CloudStep features its great sound for both mids and highs. This earbud is well made and delivers rich and robust sound. You can't go wrong with it!IN-LINE MICROPHONE: Take incoming calls and talk to your friends in the middle of your favorite melodies. The mic is in the right distance for you to talk， so you don't have to hold the mic closer.MULTI-FUNCTIONAL CONTROL: Single Click: Answer/Hang Calls， Pause/Play; Double Click: Next Song; Triple Click: Previous SongCOMPATIBLE MODE SWITCH: If you find the sound is blurred， switch it to another mode so that the earphone is compatible with your device. We add this switch design so that F1 earphone is compatible with all smartphones， tablets， etc. It works with iOS， Android and Windows Phone.PACKAGE CONTENT: 1 x CloudStep F1 Stereo Earphone; 2 pairs of quality spare eartips(Size S and Size L).Product Description: ●Drive Unit: 10mm F1 HIFI Mylar Speaker ●Frequency Response: 20 - 20kHz ●Impedance: 16Ω ± 5% ●Sensitivity: 110db S.P.L ●Plug Type: φ3.5mm Stereo ●Cable Length: 1.2m ± 0.3% ●Microphone: Built-in HiFi Mic WARM TIPS:1. Please note that this earbud is not designed for working out. So if you are looking for an earbud when working out， this earbud may not best suit your purpose.2. Please use smaller size eartips if the earbud falls out easily， which would enable the earbuds to fit more tightly in your ear canal.3. To prevent possible hearing damage， do not listen at high volume levels for long periods.