Great kit when using it as an alarm, works with other 433mhz devices such as smoke alarms, and other wifi sensors can trigger it through tuya / smartlife app. Not sure how to get the door bell to make a phone notification when it ding dongs, It works if I set the doorbell button to 'permanent protection' (panic SOS) , then you get a phone notification and a siren for at least 60 seconds. Nice thats it's firmware can be updated.