CloudStep F1 Earphone In-Ear Headphone Physical Noise Cancelling Earbud with In Line Microphone Great Full Range Rich and Robust Sound (Silver) 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 Song COMPATIBLE 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). WARM TIPS: Please use smaller size eartips if the earbud falls out easily, which would enable the earbuds to fit more tightly in your ear canal.