Biometric security devices have been available for quite some time however they are now increasing in popularity and availability. Biometric devices use unique personal characteristics, i.e.: fingerprint, voice, eye iris, hand geometry, and others to grant access.
Since no two people are exactly alike these devices are much more secure. Some devices use multiple methods to access, a code via keypad, or key lock, and some biometric technology.
These devices can be used to grant access to computers, safes, time and attendance systems as well as may types of locks. Because of the increasing popularity and availability, the technologies used and accuracy of these devices are increasing, and they are becoming more affordable.