This package includes 50 pieces of photocell light sensor that work with Arduino, ESP32, ESP8266, Raspberry Pi, or any 5V or 3.3V microcontroller. SPECIFICATION - Response time: 20ms (Rise), 30ms (Down) - Spectral Peak: 540nm - Maximum Wattage: 100mW - Maximum Voltage: 150 Volt DC - Size: 5.0mm x 2.0mm - Weight: 1g - Resistance when bright: 5-10KΩ - Resistance when dark: 0.2MΩ TUTORIALS: - Arduino and ESP32 online tutorials: DIYables light sensor