Buy an inexpensive radio and turn it on when you are going out. Better yet, put it on a timer, so it comes on at various times during the day. Radios don’t use too much power and when they are on, they make it sound as if someone is at home.
Why does this work? It has to do with the weakest link theory. Burglars rob a home that is the weakest link. Weak link homes and businesses are ones with inferior security and those that do not seem to be lived in. The sound of music playing really makes it seem as though someone is at home. It’s a small measure that can make a big difference.