MI0138B Features Stereo sound effect Standard 3.5 mm audio plug Equipped with a IP and NK switch Press the "IP" button to be compatible with iPhone， Samsung new models， HTC， Xiaomi， MEIZU， Sony， Blackberry phones Press the "NK" button to be compatible with Nokia， Samsung old models， HUAWEI， Sony Ericsson， LG， Motorola， ZTE， Lenovo， Kupai Built-in microphone Attached with a 1.2 m cable General Specs Brand & Model LANGSTON iN-28   Sound Stereo   Microphone Yes Impedance  32ohm Sensitivity 110dB/V Max. Input Power 19mW Frequency Response 13Hz-22.5KHz Connector 3.5 mm audio jack Cable Length 1.2 m Compatibility Samsung， HTC， iPhone， Nokia， etc. Package Details Weight: 57.78 g Size: 19.5*11.5*2 cm