MobilePal FlexFit Headset Audio Jack Extender for iPhone or Android Battery Cases with Gold Plated 4-Pole 3.5mm Connectors (Black) Made for devices with 3.5mm (1/8 inch) headset audio input, including iPhone or Android smartphones and tablets; works with headsets with/without volume controls, and also with Square Readers and PayPal credit card readers Extends the reach of any 3.5mm headset, ideal to be used with most battery charge cases / power case / juice packs, especially most MFi-certified battery cases made by MobilePal, Anker, Mophie, OtterBox, etc. Provides maximum conductivity and prevents corrosion with gold-plated connectors and contacts; allows consistent signal between components using high-quality copper Specially engineered for easy grip when used as extension cable for battery charger cases or juice packs 100% satisfaction guarantee with 30-day money back and limited lifetime manufacturer's warranty exclusively from MobilePal. Beware of low-quality counterfeits from other sellers