Shure SCL3 Sound Isolating Earphones with Single Wideband MicroSpeakers, Black Frequency Range: 25Hz  18.5kHz Sensitivity: 115dB SPL/mW (@ 1kHz) Impedance: 26 Ohms (@ 1kHz) Input Connector: 3.5mm (1/8) Weight: 28g (.9oz)