Nike + iPod Sport Kit

The Nike + iPod Sport Kit is a set of fitness accessories for early iPod nano models that was introduced by and Apple Computer in 2006. It included a wireless receiver that attached to the 30-pin dock connector, along with a motion sensor that could be placed inside the sole of a shoe to count the user's steps.

History
The Nike + iPod Sport Kit was jointly announced by Nike and Apple on May 23, 2006 and released on the following July 13th. The kit was superseded on September 9, 2009 by the 5th-generation iPod nano which contained its own accelerometer for use as a, though it did still support the Nike + iPod Sensor.

The Nike + iPod Sensor could also be purchased separately for the iPhone 3G S through 5 S, which do not require a wireless receiver. The iPhone 6 (and 6 Plus and later) contained its own Apple motion coprocessor and did not support the Nike+ Sensor. Users have complained about the sensor's accuracy and battery life, which only lasts about a year and is not designed to be user-replaceable. The sensor was phased out in 2014.

All current Apple Watch, iPhone, and iPod touch models contain their own accelerometers, negating the need for a separate accessory. Nike's software functionality on iOS devices has been carried over into the Nike Run Club and Nike Training Club apps.