Boost your sound with Sennheiser's CX 300S earphones which offer amazingly detailed sound reproduction and enhanced bass response thanks to precision German engineering. These earphones ensure excellent audio clarity, allowing you to hear every detail of your music. The one-button inline smart remote makes it convenient to play and pause music and take calls without needing to fumble with your phone. Four sizes (XS, S, M, L) of ear adapters are included, ensuring an individualized fit for personal comfort. The in-ear design creates a secure fit for excellent reduction of ambient noise, so you can relax and focus on the music. Connectivity technology is wired, with a 3.5mm jack connector type. Note: If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ears.