Need the schematic for

4VWIN Wireless Home Security Driveway Alarm
https://www.amazon.com/4VWIN-Wireles...e+door+monitor

or
Harbor Freight Home Security Driveway Alarm
https://www.harborfreight.com/wirele...tem-62447.html

or
? whatever name it is sold under.

I want to modify it for my special application.