12" CellPay Accessories 3.5mm audio extension cable is perfect for mobile credit card processing with very protective cases like the Otterbox. Never again remove your Otterbox to accept credit cards. Extend your 3.5mm audio port from any cell phone / mobile device tablet to your new mobile credit card reader while using your protective case. CellPay Accessories audio cable is perfect for mobile credit card processing with the Otterbox Defenders series, Trident or other large protective cases. CellPay Accessories has manufactured the only 3.5mm audio cable that works with 3.5mm mobile credit card readers on the market today.  Troubleshooting Guide FAQ!  Paypal reader / software issue - to work you must plug reader into cable 1st THEN cable into mobile phone / tablet or it will not work.   Intuit GoPayment - 1st time using cable you must go into settings in upper right and re-select your intuit reader.  Even though your reader is highlighted you must do this the first time for this to work.  30 Day Return Policy : No Refunds. Only Exchanges/Replacements.  NOT COMPATIBLE WITH LIFEPROOF.