NIKE+IPOD

Ø Create workout playlists
Ø See how far and how fast u've run as well as how many calories u’ve burned
Ø View statistics about ur past workouts
Ø Set ur workout goals
The Kit has two components -- a sensor and a receiver, both of which are about an inch (2.5 centimeters) long. The sensor fits into a small space under the insole of a Nike shoe. The receiver plugs into an ipod NANO The Nano is not included, but it is required for the system to work. It provides battery power for the receiver and a user interface for the workout software. Runners use their Nano's click wheel to control the software, which is accessible through the "Nike+ iPod" menu.
The sensor fits into a hole under the insole of a Nike+ running shoe. It detects the runner's footfalls through its piezoelectric accelerometer.Piezoelectric sensors, on the other hand, use quartz, silicon or manmade crystals that produce electricity when squeezed, moved or bent.The accelerometer in the Nike+ sensor detects when a person's foot is on the ground. When someone is standing still or walking slowly, his feet spend more time touching the earth than in the air. But when jogging or sprinting, his feet spend less and less time on the ground. The faster he runs, the less time his feet spend in contact with the surface under them. Because of this basic trait of walking and running, a processor can use equations to convert contact time into running speed. The process is the most accurate when runners calibrate their sensors by running a pre-set distance so get a baseline reading.The accelerometer also acts as the sensor's on/off switch. When the shoes aren't moving, the accelerometer has no footsteps to report -- it stops sending data. In the absence of the accelerometer's output, the sensor eventually puts itself to sleep. But when a runner puts his shoes on and takes a few steps, the sensor generates electrical pulses, and the sensor resumes operation. The sensor also has a physical switch which can turn the unit off; the unit stays off until someone presses the switch again. This preserves the battery's life (the 1,000-hour battery can't be replaced) when someone isn't running regularly or is running in different shoes.
The Nike+ iPod sensor sends information to the receiver using a built-in transmitter and antenna. It broadcasts its data at a radio frequency of 2.4 gigahertz using a proprietary protocol. In addition to transmitting data about a person's running stride, it transmits a unique code that it uses to identify itself. We'll look at how the receiver uses this information next.
The Nike + iPod Receiver:The first time someone uses the Nike + iPod system, the sensor links to the receiver. The receiver learns to recognize that particular sensor's identification code. For this reason, multiple people can run together without their Nike + iPod sensors interfering with one another. If several people in one family use the same iPod but different sensors, the receiver can learn to recognize each sensor, and the Nano can store different settings for each user.
This system is flexible, and the 60-foot (18.2-meter) range of the transmitter makes it unlikely that the two parts of the system will lose contact with one another. However, the sensor's relatively long range has raised privacy concerns about the Nike+ system
Just a minute friens….You may be tracked sometimes by this kit….ofcourse
In order to track someone using the Sport Kit, a perpetrator must:
Ø Determine the identification number of the victim's sensor in order to track the right person.
Ø Conceal receivers and antennae, ensuring that the victim will pass within 60 feet (18.2 meters) of them
Ø Develop a method for retrieving and analyzing the sensor's data .
This information is just to alert you from the trackers.so Enjoy the technology being @ da safer side.