Agreed. Using the dock connector with a legitimate product requires you to join Apple's "Made for iPhone" program. For a device like Square that works on mult

Agreed. Using the dock connector with a legitimate product requires you to join Apple's "Made for iPhone" program. For a device like Square that works on multiple platforms, the audio jack is a common interface and the Square reader has the benefit of requiring little (to zero) power to function as it consists of a magnetic head that works when a card slides across it.