tone of voice

retina of the eye and other biological characteristic features. The appropriate biometric security systems should be chosen carefully and based on its application also. Signature biometric checks the signature of the user and also it measures the speed and pressure used by the person. Voice based biometric system notes the voice of the user and it is stored for further references. The finger prints of every user are loaded into the system and the person can gain access only after his fingerprints have been matched by the machine. Digital cameras are sometimes used to develop the images of the individuals and iris based technology usually identifies its user on the presence of color based tissue surrounding the pupil.