If your here I don't think you will be making jack , just an honest opinion no offence
As above China will do it all for you , but better to learn mandarin first
I have a broken set , they are no good for to much use outdoor , odd occasional job , I think mine cost about £140 ten years ago , it did its job for the job I needed it for, and that job paid for them anyway i uesed it handful of times
They haven't changed much , if I need another I will price it in on the job I need it for and have it new each time lol
Internal battery needs disconnecting aswell
The internal bell maybe Sab type so may need battery disconnecting in that to
Most external ADT boxes are dummy but few are live bells but it should due after 20mins anyway otherwise have ladders ready