Originally Posted by locknut
They all are coded much like garage door openers, so chances of spurious interference is virtually non-existant.
For binary coded [on/off] switches, for 4 switches the likelihood is 1 in 2^4 = 16 that someone will hit upon your combination at random. 8 switches, 1 in 256.
How many houses are within 150' of your house?
By comparison, the chances of my/your house burning down, per year in the US, is probably 1 in 1000.