Notifications and alerts work by sending a message or email to your device when motion or sound has occurred. This feature is only found in the Wi-Fi monitors, and isn't the best feature for baby because it comes after the fact (sometimes up to 30 min or more after), it does not offer details of the type of sound or motion detected, and could get annoying with useless and excessive messages being sent. In the end, we prefer sound activation over notifications and feel that alerts and notifications aren't all that useful for keeping tabs on your baby.
Monitor options: We wanted easy, intuitive, responsive controls, whether they were on a touchscreen or using physical buttons. We also wanted the monitor to withstand being knocked off a nightstand or messed with by a toddler, and generally be tough enough for the rigors of life in a home with young children. We didn’t really care whether or not we could set an alarm, use it as a nightlight, or play chintzy music through the camera—but seeing a temperature in the kids’ room was a detail we appreciated.