You can EASILY do it yourself, IF it has the function, as EU are trying to ban it being available as it is ILLEGAL IN certain(most) EU countries as it is classed as NOISE POLLUTION.
There are loads of SELECTABLE functions such as headlight timer etc as well on this model as well as the alarm beep which has three volume levels, + pre warn alarm.
If you PM me your addy I can send you a sheet with them all on.
You MUST have your little card you would have been given with your 3 or 4 digit code on it ?, as you need this to enable changes to settings.
As I say loads of features are there, but most alarms TOAD wise have this function turned off despite what literature says.
tabetha