An alarm can be a highly effective piece of security equipment. Not only will it deter the theft of the computer, but the power of a modern computer alarm will help hasten the thieves' exit from the building.

Secure PC
produce a range of computer alarms to protect all types of computers and peripheral devices.
 
Internal Alarm Card
This card uses an expansion slot and is provided with a combination lock. The card draws a trickle charge from the power supply. It is designed to operate when the machine is switched off or has power interrupted. When this occurs it is instantly alarmed. While a user is working on the machine the alarm will not be set off by bumps or knocks. The card protects the computer from movement or if the lid of the computer is opened.

Price guide: £39
 
BOSS Tx
This is a universal alarm that will sit inside or outside any piece of computer equipment.
Price guide: £69
 
Kensington Sonic Alarm
A neat device to audibly alert you to unauthorized movement of your computer. Simply slot the supplied attachment into the security lock, close the shackle and set the alarm. Any movement and a loud alarm alerts everybody that somebody is trying to steal your notebook. Can also be secured to luggage or handbags. Uses combination lock. Highly recommended for the busy traveller.
Price guide: £30 + vat.
 
Compal Surge Protector/alarm
This device both protects your computer from surges of electricity and once your computer is plugged in will alert you via a 130 db alarm if somebody tries to remove the equipment. Can secure up to 10 machines in a cluster.
Price guide: £295