PowerTap SLC+ User Guide - Manual (Page 32)

5) Follow the above steps for any additional sensors you may be using,
such as the heart rate strap, speed and cadence sensors. The sensor
name is shown on the top line of the display.
SPd = speed sensor
Cd = cadence sensor
HS = heart rate sensor
Press [SELECT] to toggle through the digit values to get the I.D. Press
[MODE] to advance to the next digit. When the last digit is set, press
[MODE] to save and advance to the learn functions for that sensor.
Press [SELECT] to initiate the learn functions as needed.
Note: Changing the batteries in the speed sensor, cadence sensor or
heart rate sensor creates a new ID for that device. If other computers are
pairedusing the old ID, they will need to re-learn the sensor.
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SPd
Cd
HS