Sennheiser's CX range features lightweight, portable designs that offer an excellent experience for those that demand better sound when on the move. The range distils Sennheiser’s expertise in in-ear headphone design to ensure excellent clarity across the frequency range – carefully tuning the high frequencies for a smooth, accurate reproduction. At the lower end, Sennheiser’s CX headphones serve up powerful yet discrete bass that still maintains great clarity in the midst The CX 1.00 and CX 3.00 are ready to use with all devices, the CX 2.00 and CX 5.00 come with an inline three-button remote with integrated mic – for Apple and Samsung mobile devices.