"Expand the world of Nike + iPod" Simplism Sport + iPod Sensor Holder is a sensor holder that makes Nike + iPod more convenient, and the sensor becomes usable even with running shoes other than Nike shoes. By using Sport + iPod Sensor Holder, Nike + iPod Sensor can be attached to any of your favorite shoes with shoelaces while it is originally made for Nike + running shoes, and still get full feature of the Nike + iPod. The shape of Sensor holder perfectly fits and securely holds Nike + iPod Sensor, and the silicone material protects from shocks. A flap portion is thicker to increase the durability and the edge is sliced in angle for easy opening. The holder comes in 4 colors and can be matched with the color of shoes. The fun combination of color with the button makes you want to run as soon as you are ready to go."Achieving a high level of usability" While Nike + iPod changes routine work out more fun and effective, the system requires a pocket for a Nike + iPod Sensor under Nike + shoe insole for pedometer measurement. It consumes battery life once Nike + iPod Sensor is worn in a shoe even when it is not needed. Moreover, once the built-in battery in a sensor dies, a new sensor has to be purchased because it is not replaceable. Sport + iPod Sensor Holder makes it possible to put and remove the Nike + iPod Sensor in a simple and easy way and saves the battery life. A Nike + iPod Sensor can be shared among friends and family with Sport + iPod Sensor Holder for its quick and easy attachment and removal. Simply hand it down to a person who needs it at a moment.