Dont bother

Additional hardware needed!!!!!Apps should run the iPhone as your hardware to make life easier, not urging the purchase of additional hardware. Mention that in your description. It is not mentioned that the extra transmitter
is needed.

Man, I just now created an app to air up my car tires. Just open " maps" type in gas station and itll take you there, where youll need to have 4 quarters for the air pump.

Iphoniacc about FM TRANSMITTER CASE