Racal Guardall motion detectors

["CH®IS" <sh@xxxxxx>]

Looking for a little info on Racal Guardall motion detectors.  I have one
from a takeover we did last week, and am wondering how old it is.

It's the "Apollo C" model, batch number 8814, which somewhat resembles this
pic (best one I could find at the moment)...
http://www.abrsecurity.com/Astra.gif

Any info would be appreciated, despite the fact that this thing is already
half way into a garbage can.

- Chris