ctronics CTSC-J7 Manual Del Usuario página 13

4: Connect the indoor chime
①Push the reset button.
Push RESET on the chime, and the chime indicator on the left
will flash red for 20 seconds, indicating that the chime is in
pairing mode.
②Press your doorbell to pair up.
Press the doorbell button to send a pairing signal, and your
chime will sound to react, together with the flashing blue LED.
Chime pairing is successful.
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