[Home](./index.md) > [@digitalpersona/devices](./devices.md) > [DeviceTechnology](./devices.devicetechnology.md) ## DeviceTechnology enum A fingerprint reader technology (a method of scanning) Signature: ```typescript export declare enum DeviceTechnology ``` ## Enumeration Members | Member | Value | Description | | --- | --- | --- | | Capacitive | 2 | The reader uses changes of electrical capacitance of a finger skin. | | Optical | 1 | The reader uses an optical image of a finger skin. | | Pressure | 4 | The reader uses changes of a pressure under the finger. | | Thermal | 3 | The reader uses a thermal image of a finger. | | Unknown | 0 | The method of scanning is unknown. |