See also:

Programming HomeLink
1. To begin, press and hold the two outer HomeLink buttons (to clear the memory) until the indicator light 1 blinks (after 20 seconds). Release both buttons. 2. Position the end of the hand-held ...

Battery replacement
Be careful not to allow children to swallow the battery and removed parts. ...

Temperature
High temperatures accelerate the rate of corrosion to those parts which are not well ventilated. ...