Product Specifications: Material: Metal+TPE Wire Length: 130cm/4.27ft Wearing style: In-ear Driver Type: Dynamic Speaker diameter: 8mm Sensitivity: 116dB Impedance: 32Ohm Frequency Response Range: 20Hz-20KHz Plug type: (straight type) 3.5mm Gold-plated With the microphone: Yes Built in 3.5mm Audio OMTP to CTIA / CTIA to OMTP Converter Button Adaptor : Button to convert your smartphone headset from CTIA (aka AHJ) to OMTP. Technically, it switches the position of the mic and ground on your 3.5mm TRRS smartphone headset plug allows you to use your existing headset and inline remote with your smartphone. AHJ/CTIA Phones: Apple (uses different remote signal), most smartphones, HTC, LG, Blackberry, latest Nokia (including 1st gen Lumia as well as later models), latest Samsung, Jolla, Sony (Dualshock 4), Microsoft (including Surface and XboxOne controller with chat adapter) most Android phones OMTP Phones: Older smartphones, old Nokia (and also Lumia starting from the 2nd gen), old Samsung (2012 Chromebooks), old Sony Ericsson (2010 and 2011 Xperias), Sony (PlayStation Vita), OnePlus, etc. NOTE : If the volume is very soft, is only background sound, voice or no voice is small with this headset, please change the mode by move the switch button on the headset, which will make the headset compatible with your phone. This built in Adaptor/Converter is a Huge advantage for customers using the headset for multiple devices and also old devices which are not compatible with latest headphones.