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.Check out our Types of Car Seats Guide to learn more.Share the SensAlert device with up to 3 users simultaneously. 3 alert levels: phone notification, phone call to smartphone, and emergency contacts. Add 5 emergency contacts in the app. Automatically connects to the smartphone's Bluetooth. Low-frequency Bluetooth signal. Sends a notification when the device's battery is low. Compatible with most car seats and boosters. Battery included. Hand wash only. Made in Italy. Made in Italy.