Excellent sports earphones for smartphones. They have a built-in microphone, answer button call and adjust the volume level. They have a switch S / N allows you to adjust the earphones to work with different standards. "S" for CITA 3.5mm jack (including iPhone, Samsung, HTC, LG, Sony, Blackberry, Nexus) and "N" for OMTP 3.5mm jack (such as Nokia, music players). Specially profiled and reinforced cable holds earphone in place even during sport activity. Lightweight design combined with soft rubber bands improve convenience. The set includes two additional rubber bands of different sizes.