Oklahoma physician and entrepreneur Dr. David Albert has invented a device that turns an iPhone into a heart monitor.

The AliveCor iPhonECG is a slim case that fits over a smart phone. Low-power electrodes on the case are pressed against the fingers or chest of a person to display electrical activity of the heart.

It can be used to detect a heart blockage or unstable heartbeat, or to monitor heart rate during exercise or stress reduction techniques.

The advantages are great, Albert said. The device will work anywhere there's wireless coverage — including most rural or remote parts of the globe — and is cost effective, expected to retail for less than $100.