Overview: The KY-039 Finger Detection Heartbeat Sensor Module utilizes a bright infrared LED and phototransistor to effectively measure heartbeats. This versatile pack includes 5 modules designed for Rduino projects and health monitoring applications.Key Features:- Measures pulse using infrared light technology- Bright LED indicator for clear heartbeat visualization- Adjustable resistance for optimized performance- Shields against light interference for accurate readings- Includes 5 modules for multiple applicationsTechnical Specifications:- Operating Voltage: 5V- Material: High-quality electronic components- Dimensions: Compact module for easy integrationApplications:- Rduino projects and prototyping- Heartbeat and health monitoring systems- Educational use in electronics and biology- DIY wearable health devices- Emotional and biometric research projects