Q1. Why i can not receive the mobile message at advertised time when i open/close the door or window?
The time range is about 8-15s depend on the wifi network, it exists delay if the wifi network is not good.
Q2. Why i can not hear the alarm when i open/close the door or window?
Firstly, please check the setting in your mobile, select Notification, and find the App, and slide on in the notification. Secondly, make sure you have slide on in the alarm of the APP.