One RemoteLync Monitor will provide coverage to an average-sized house (approximately 2,000 sq. ft.). If your home’s alarms are interconnected – meaning when one sounds they all sound – one device will provide coverage regardless of the size of your home. The key is placement. As long as your monitor can hear the smoke or carbon monoxide alarms farthest away from where the unit is placed, or the nearest unit if your alarms are hardwired, you should only need one per household. Our set up guide will walk you through this step.