Chamberlain MOTORLIFE HC100ML-2 Mechanical Installation Instructions page 49

CONTACT STRIP (OPTIONAL)
A contact strip working according to the 8.2 kilo ohm principle can be
connected to the control board, i.e. a 8.2 kilo ohm test resistor is
attached to the end of the contact strip. It ensures that the electric
circuit is monitored permanently. The control board is supplied with an
8.2 kilo ohm resistor installed. Several contact strips are connected in
series.
Cable cross-section: 0.5mm 2
ANTENNA (OPTIONAL) ANT4X-1EML
The control board is standard-equipped with a wire antenna.
An external antenna (accessory) can be connected to terminals 22
and 23. A larger range (radio) can thus be achieved. Mount the
antenna as high as possible.
Do not use any fixed copper lines. Do not lay any 230 volt
cables in parallel and do not lay any 2 cables in the same cable
trunking.
RADIO MODULE (PLUGGED)
To operate the control board via radio remote control, a radio
module must first be installed in slots CN4/CN5.
TEACHING / DELETING THE HAND-HELD TRANSMITTERS
Press button CH1. The LED "Learn1" lights up red. Now press one of
the transmitter's button for approx. 5 seconds. The LED "Learn 1"
flashes now. Finished. Proceed in exactly the same way for CH2.
However, now press one of the transmitter's buttons that has not yet
been assigned. Up to 128 hand-held transmitters can be
programmed in this way.
To delete the programmed transmitter setting, simply press button
CH1 until the LED goes out. Proceed in the same way for CH2.
or more.