The Koss KE10M Jams Flexible Earphones feature super soft, sculpted earbuds designed for long-lasting comfort and a flexible fit suitable for any ear size. These earphones have a 3.5mm input jack for compatibility with a wide range of audio devices including smartphones. They deliver clear audio with a frequency response from 40 Hz to 20 kHz, an impedance of 32 Ohms, and a sound pressure level of 100 dB SPL. The cord length of 4 feet provides ease of movement during use, making them suitable for on-the-go listening and workouts.