Help Needed With Alarm

I have a Cobra Bridge 4100 fitted on my 110. When the alarm is armed the lights flash 3 times and I get 3 beeps. After 20 seconds or so the alarm goes off. I've done all the usual stuff and made sure all the doors and the bonnet are shut securely. Also, can't seem to find in the Cobra leaflet anything about what 3 bleeps signifies. Any help much appreciated as my landy is sat outside with no alarm atm.

User manual Page 20 Para 4.11
http://www.manualslib.com/manual/852220/Cobra-Bridge-4100.html?page=8#manual

Kwakerman said:

User manual Page 20 Para 4.11
http://www.manualslib.com/manual/852220/Cobra-Bridge-4100.html?page=8#manual

Click to expand...

Thanks Kwakerman.