Burglar alarm

A burglar alarm is a wall-mounted object that can be bought in buy mode to automatically alert the police that a burglar is on the property.

In all games, it is impossible to enter Build Mode or Buy Mode after a burglar enters the lot. It is important that players properly secure the lot with the burglar alarm before a burglar arrives.

The Sims
In The Sims, a burglar alarm will cover an entire room when placed indoors. If placed on an outside wall, it will cover a 5-tile radius.

An easy way to make a house burglar-proof is to build a single wall on both sides of the lot and put a burglar alarm on each; when a burglar enters the lot, the alarms will be set off instantly, resulting in the police being summoned immediately, often before the burglar can even enter the house.

The Sims 2
In The Sims 2, burglar alarms will cover the entire room it is placed in. Burglar alarms cannot be placed outdoors, unless the moveobjects cheat is used. Each room with a door to the outdoors should have an alarm. If placed outdoors using cheats, the burglar alarm will cover the entire outside area, obstructed only by outdoor fences.

The Sims 3
In The Sims 3, burglar alarms can be placed on any wall of a residential lot, inside or outside. The alarm will sound if a burglar enters through the front door or close proximity to the alarm when placed outside. It also costs more than the previous generations.

If a burglar alarm is put on the outside of a house, it will go off as soon as the burglar is on the lot.