Ensure the Alarm Base Station is plugged in and turned on:

STEP 1. From the App on your phone, on Alarm home screen tap Accessories > +, then the base station goes into the pairing/sniffer mode with all indicators blinking.

STEP 2. Place batteries into the alarm, and before its 20 second sniffer countdown expires, press the “Test” button on the alarm, a light will flash and sound alert.

The carbon monoxide monitor will send a transmission signal to the base station and once paired the base station emits a sound.