Compatible with most car seats and boosters, the Doona Lab SensAlert reminds you when your little one is in the backseat so you don't leave them unattended in the car. It detects the presence of a baby on board and triggers the alert system when a caregiver (and their smartphone) moves away from the vehicle. Powered by the Doona app, it uses a cloud-based system to call and send messages so it doesn't rely on your smartphone's signal or status.