Compact circular capacitive fingerprint identification module model R503 designed for straightforward integration into 3.3V systems. The module combines a spacesaving form factor with a twocolor ring indicator to provide clear status feedback and simple user interaction. Key benefits Reliable user authentication for secure access and device control using capacitive fingerprint sensing. Twocolor ring indicator provides immediate visual feedback for enrollment and verification status, reducing setup time and user confusion. Native DC 3.3V operation makes the module compatible with most 3.3V microcontrollers and singleboard computers, simplifying power and logiclevel requirements. Compact circular design and panelready appearance minimize footprint and fit neatly into enclosures and control panels. Easy to install and integrate, allowing fast deployment in prototypes and finished products without extensive mechanical or electrical modifications. Important attributes Function: fingerprint identification module using capacitive sensing for touchbased fingerprint recognition. Model: R503. Power: DC 3.3V operation for lowvoltage systems. Indicator: integrated twocolor ring light for clear status and user feedback. Form factor: circular, compact module suitable for panel mounting and recessed mounting in enclosures. Material and build: durable sensor housing designed for repeated use in access and control applications. Performance: responsive fingerprint reading optimized for reliable identification in embedded projects. Typical applications Secured access control for small doors, cabinets, and lockers where compact hardware and visual status indication are required. User authentication for time and attendance terminals and small office systems that run on 3.3V controllers. Integration into DIY electronics, IoT devices, and custom control panels for smart locks, industrial machines, and projects. Integration notes Designed for easy electrical and mechanical integration into systems that operate at 3.3V logic levels. The circular, lowprofile module fits panel openings and enclosures with minimal modification. Suitable for developers and integrators who need a compact fingerprint identification solution with clear visual status feedback. This module provides a practical, lowvoltage fingerprint identification option for projects that require compact sizing, straightforward installation, and clear user feedback.