1) Speaker: 30mm 2)Frequency range: 20-20KHz 3)Impedance:150ohms?5%@1KHz 4)Sensitivity: 126?dB (finished headset)@1KHz 5)Rated & Max. power input:5mW&10mW 6)Connector type: 4p4c crystal plug 7)Cord length:1830?25mm 8)Accessory: spare foam earpad or cloth carrying bag 9)W/QD (Quick disconnect ) function & mute 10)White box packing