The SensorSafe 4-in-1 Safety Kit Toddler is a smart solution for keeping track of the safety and well-being of your child. Compatible with all CYBEX Sirona car seats. Peace of mind for you, better safety for your child. Once attached to the harness system of the child car seat, the SensorSafe 4-in-1 Safety Kit can be connected to your smartphone and will alert you to critical situations such as: if your child is left in the car, if temperatures in the car get too hot or cold, if the child unbuckles the clip or if they’ve been seated for too long.