CablesOnline 6" TRRS 3.5mm 4-Pole M/F iPhone/Tablet to Credit Card Swiper/Reader Adapter Cable, Black, (IP-AD08K) Extremely light weight and small design makes for convenient and easy use (1) 3.5mm TRRS male stereo plug (1) 3.5mm TRRS female stereo jack Easily connects your phone or tablet to a mobile credit card reader (PayPal swiper, Square, etc)