Apple Nike + iPod - Manual (Page 7)

Step 3: Insert the Nike + iPod Sensor in your Nike+ ready shoe.
Lift the insole of the left shoe, remove the foam insert from the pocket underneath, m
and replace it with the sensor, flat side up.
Sensor
You can leave the sensor in your shoe when you aren’t working out, but if you plan to
wear your shoes for a long time without working out, replace the sensor with the foam
insert to save battery life.
The battery in the sensor is not replaceable or rechargeable and has a life of over 1000
active hours. Battery life varies depending on use and other factors.
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