The free Square Reader works with the free Square Point of Sale app to allow everyone to take payments on their smartphone or tablet. Square Reader plugs into a standard headset jack or a Lightning port when used with a Lightning Adapter for Square Reader. Card information is encrypted at the moment of swipe. Square doesn’t store data on your device after a payment has been processed. Send receipts via email or text message, or connect a receipt printer to a tablet. Personalize your signature screen and receipts with a logo and cover photo.