Acoustically advanced MEElectronics M6 series earphones deliver clear, accurate sound from any portable music or DVD player. Over-the-ear design leaves the wires behind your body, best for your sports activities. Lightweight, in-ear design blocks out ambient noise better than many bulky battery-powered noise-canceling earphones. Enjoy full dynamic range of your favorite music and movies without cranking up the volume to unnatural, or even unsafe listening levels. 9mm drivers with neodymium magnets. Frequency response: 20-20,000 Hz. Impedance: 16 ohms. Our earphones require proper seal to achieve best sound quality, please choose from provided tip sets that best fits your ears. "MEElectronics stands behind our products and wants you to be satisfied. From time to time achieving a good fit and therefore proper bass response and sound for in-ear headphones can be challenging. If your MEE in-ear headphones don't sound great for the price or you have any other issues, please contact our customer service department at firstname.lastname@example.org."