A home intruder generally has two requirements for a potential score: he has to be able to get in and out quickly, and he must remain unseen. If either one of these conditions isn’t met, usually he will move on to the next house.
Many burglars prefer the cover of darkness. Make sure your lights illuminate darker areas like back doors and windows, shrubbery, walkways and entrances to your garage and basement.
Timers for interior lights If you’re going away on vacation, put timers on your interior lights. From the sidewalk your home will look occupied, encouraging burglars to move on without trying to break in.
Security deadbolts For your last line of defense, make sure you install deadbolts on every entry door to your house. As a minimum, your deadbolts should have Grade 2 security features.
Security system include perimeter sensors on outside doors and windows, motion detectors in key inside areas, a control unit to interpret and respond to signals from the sensors, a siren or other alert mechanism, and a connection to a central monitoring station to notify the police. Fire detection and medical emergency devices are other available options.
Resource: Apartment security tips