Connectivity Connect your iPhone, iPod, MP3 player, CD player, smartphone, tablet or any audio device with a 3.5mm headphone jack to your headset with microphone, credit card readers, car, office or home audio system. 4-Pole Tip-Ring-Ring-Sleeve (TRRS) Connectors FosPower 4-conductor TRRS stereo audio extension cable has an additional conductor that allows you to extend the length of your 3.5mm headset that supports microphone. It is also compatible with credit card readers such as Square Reader, Amazon Register Card Reader, and PayPal Here Card Reader. Also works with voice commands such as "Siri" and "Ok Google". Beveled Plugs Beveled step down design plugs ensure FosPower premium stereo audio cable to be fully seated into audio port and compatible with most cases in the market. 24k Gold Plated Connectors FosPower premium stereo audio cables are made from high quality 24k gold plated connectors that resist corrosion and reduce tarnish. Dual Layer Braided and Foil Shielding FosPower stereo audio cables are copper braided with aluminum foil shielding provides cable flexibility and reduces unwanted EMI/RFI interference. PF Insulator The core of the FosPower stereo audio cables are covered with polyethylene foam (PF) dielectric insulator which greatly minimizes signal loss. Tin Plated Copper Core The tin plated copper core of the FosPower stereo audio cables reduces oxidation and increases the wire life. Limited Lifetime Warranty This product comes with a limited lifetime warranty. Please refer to FosPower's website for more information.