Features: This Finger Vein Scanner Module is base on a 32 bit for ARM Cortex-M4F processor, with a main frequency 192MHz. Supports DSP instruction set, and can run biometric recognition algorithms efficiently. Adopts a separated structure design of the light board, which is convenient for embedding various devices and enhancing the overall integration of machine. This module have good platform adaptability and scalability, and supports rapid development and deployment. Widely apply in door lock, sliding handles, small lockers, access control and attendance systems and other security devices. Features a high precisions and dense integrated single board circuit design. Specifications: Material: Plastic Response Speed: ＜1s Working Voltages: 3.3V±3% Working Current: ＜19.5mA Size: About. 4x3.6cm/1.57x1.42in Package Includes: 1 Set Finger Vein Scanner Module note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.