MobilePal MP &ndash; AJE &ndash; BLK Flex Fit Headset Audio Jack Extender for iPhone or Android Battery Cases with Gold Plated 4 &ndash; Pole 3.5mm Connectors &ndash; Black Made for devices with 3.5mm (1/8 inch) headset audio input, including iPhone or android smartphones and tablets Extends the reach of any 3.5mm headset, ideal to be used with most battery charge cases/power case/juice packs Provides maximum conductivity and prevents corrosion with gold-plated connectors and contacts, allows consistent signal between components Specially engineered for easy grip when used as extension cable for battery charger cases or juice packs