Hamdol Adapter Headphone Jack Adapter Earphone to 3.5mm Jack Aux Audio Stereo Adaptor It allows you to Control Music (volume, previous/next) , just connect audio headphone/earphone It contains a decoder chip so you don't have to worry about system upgrades. No extra software, you just plug in and enjoy pure high fidelity sound quality. supports 48 KHz and 24-bit audio output, maintains the original headphone sound quality We will provide 12 months of product quality assurance and permanent dedication.