The system will not function properly if you
use anything other than alkaline batteries.
Also, you do not want to use Duracell,
Energizer or Radio Shack brand. These high
end brands use technology that will cause
the sensors to no function properly. You
want to use a generic alkaline brand like
Rayovac, Panasonic, Walgreen's, etc. These
will work better and you should only need to
change them every 12 to 14 months.