The silence feature is intended to temporarily silence the horn while you identify and correct the problem. DO NOT use the silence feature in emergency situations. It will not correct a carbon monoxide problem or extinguish a fire. The silence feature can temporarily quiet an unwanted alarm for several minutes. You can silence the Onelink Safe & Sound by pressing the Test/Silence button on the alarm cover for at least 3-5 seconds or via the Onelink Home app. After the Test/Silence button is released, the red LED stops during the silence mode.