[Spridgets] wireless intrusion detection system?

[corvallis at peoplepc.com]

I would like to put a Wireless intrusion detection system in my garage.
There are several I've found using the internet but users don't rate them
very well; quality problems (China) and lack of wireless to get through
several walls and into the house. I would like to have two motion detectors
in my adjacent garage and a receiver for them in my house. I don't need an
alarm as such; and I'm not going to run out there and get into a situation. 

I had such poor luck on the internet (Consumers Report and Buyer's Guide)
that we visited the local alarm sales place. They prefer to use wired
system$. 

Suggestions and comments appreciated. .bill in corvallis