Hi,
Thanks. I get it figure out and it works on my door sills.
The reason that doors sills not light out correctly, because of the distance is too big between the sills and magnetic sensors. Once the door sills can not detect these two tiny sensors, they fail to light up.
After few failed attempts, I found a very good solution to fix this. I attached two Smart Alarm Magnetic sensors under the doors. And their size just perfect to fit gap between doors and sills. Finally the door sills just light up beautifully.
FYI, the magnetic sensors that I used are leftover spares parts in my house. I didn't spend a penny on this fix.
Here is the image of the sensor:
Here you can buy the sensor from Amazon:
http://www.amazon.com/iSmartAlarm-iS...talarm+sensors