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Technical Data: Drive unit:Moving coil dynamic speaker. Speaker size: 40mm. Magnet: Neodymium. Frequency Response: 18Hz-22KHz Sensitivity: 113+/-3dB At 1KHz1mW. R&L balance< 3dB(20Hz-10KHz 1mW). THD, total harmonic distortion: <3%. Impedance: 40 Ohm. Rated input power: 10mW. Maximum input power: 20mW. Cable Type: TPE cable Cable Length: 1.2-2m Plug: 3.5mm gold-plate.