Sennheiser CX 6 High Fidelity Sound Earbuds with Noise Reduction - (Discontinued by Manufacturer) Customized fit for outstanding noise reduction Reduces up to 90% of noise pollution Includes vital travel accessories including ear adapters, clothing clip, airline/impedance adapter, case and cleaning tool Shorter, dynamic drivers for full-spectrum sound without deep ear penetration Compatible with all devices with 3.5mm stereo plug (1/8 inch)