If a smoke detector is linkable, you can connect it to another linkable smoke detector. The advantage of linkable fire alarms is that when 1 smoke detector goes off, the other smoke detectors also go off. This means you'll be warned in time throughout the house in case of fire or smoke development. For example, is there a fire in the kitchen, but are you in your bedroom? You'll also be alerted in time. This way, you're always informed in case of fire or smoke. That gives a safer feeling.