Moki Sports Earphones. White. Ideal for use with most fitness activities. Rubberised flexible ear hooks can be shaped for a secure hold with minimal movement allowing them to be comfortably worn the entire session. The chromed bass vents enhance bass performance while 15mm speaker drivers deliver the full response for a natural & balanced sound. Suitable for use with any 3.5mm audio device. - MP3, portable CD, DVD & media players. Speaker Dimension : 15mm. Sensitivity : 116dB @ 1kHz. Impedance : 32ohm. Frequency Response :20. 20000Hz. Rated Power : 50mW. Cable Length : 125cm. Plug : 3.5mm.