hey guys i gotta clifford concept 300 and coupla times now when i lock/unlock it does it silently instead of beeping! then few days later starts beeping again!!! tried silently arming/disarming to see if would start beeping again but no luck ! any ideas!????? i know the 300 is quite old now but everything else works fine!!!

Probably the battery in the siren on its way out.

hmm is this easy to replace or does a professional have to do it? dint realise it had one! do you know whta type of battery? cheers

Take it to the dealer and get a new siren fitted. That will cure your problems. You can replace the battery but it's more hassle than it's worth.