Post clearly visible "warning decals" on doors and windows.
Make it a habit, part of your routine, to ALWAYS arm your alarm system when you leave.
Encourage employees to keep their heads up and eyes open.
Require receiving doors to be closed immediately following a delivery.
Light all exterior points of entry with permanent fixtures, which are difficult to reach or tamper with.
Light the interior of your business enough that someone outside the building could see someone inside.
Start with a good dead bolt lock AND make sure the frame is reinforced!
Don’t overload your electrical circuits. Remember, if a Circuit Breaker trips 2 or more times in close succession, there is an electrical problem that needs immediate attention.
Practice with your system in order to prevent false alarms.