The Sunfounder Optical Fingerprint Reader Sensor Module is the perfect tool for your Arduino 2560 R3 Raspberry Pi ESP8266 ESP32 51 AVR STM32 projects. This module features a red light DC 3.8-7V and can store up to 162 fingerprints for a secure and reliable access control system. With its high quality and reliable performance, you can trust Sunfounder to deliver a product that will get the job done.