FAQ: Is it possible to switch the alarm off at night?
Please see a couple ways to do this:
Use the TCO-47, this is a timed cutout device that will disable the alarm for 4 minutes find details here.
Use the NS-2 or NS-3 modules, these are double engage cut out devices. When reverse is selected twice in the specified time (2 seconds for the NS-2 & 3 seconds for the NS-3) the alarm will be disabled. The function is disabled when reverse is disengaged again. Details on these devices can be found here.