Lost the instructions for this $30.00 motion detector that runs on 4AA
batteries.  When I replaced the batteries, the alarm defaulted to the
original factory code.  But I can't find the instructions.  Would like
to know what the code is (likely 4 digits) and also, if possible, how
to customize the code.  As it now stands, I set off the alarm
everytime I enter the room -- but can't silence it.  (It stops
automatically after 30 seconds)