The M2 IEi gives you exactly what you can expect from a Sennheiser Momentum product. The stainless steel housing is shaped to ensure that every sound is audible exactly as it was intended. Powerful bass tones, detailed vocals, and a broad musical range are all combined in one of the most compact pairs of in-ear earbuds on the market. To help you get the best from your Momentum M2 IEi, it comes with 4 different sleeves for the perfect fit. The remote control lets you control your music and receive incoming phone calls. The cable controls are optimized for Android and don't work with Apple.