Turn pedometer on (shake the unit) and push the MODE button until you see "STEP" in the upper right corner.
Push and hold down the MODE button for 3 seconds and "12 Hr" will start to flash.
Push the MODE button 5 times until you see "24 In" flashing. This value is your stride in inches.
While "24" is flashing, push the SET button repeatedly until you see your stride length appear.
Press the MODE button twice to save and exit.