Features Response Time: With A Response Time of 20ms In Bright Light And 30ms in Dark Light, This Photoresistor Ensures Quick And Accurate Light Sensing. Semiconductor Material: The Photoresistor Is Made of Semiconductor Material, with Its Conductivity Varying with Changes in Light Strength. Pack of 50: The Set Includes 50pcs of 5mm Gm5539 Photoresistors, Featuring A Leg Length of 31mm, Providing Ample Supply for Your Projects. 20 Light Sensors: The Photo Light Sensitive Resistor Has 20 Light Sensors, Ensuring Stable And Reliable Light Measurement. Wide Application: The Light Dependent Resistor Is Widely Use in Our Daily Lives, Including Photoelectric Control, Automatic Exposure in Cameras, Indoor Lighting Control, Alarm Systems And More. Specification: Item Type: Photoresistor Material: Sedimentary Film Model: GM5539 Maximum Voltage: 150V DC Maximum Wattage: 100mW Spectral Peak: 540nm Light Resistance (10Lx): 50-100Kohm Working Temperature: -30℃ to +70℃ Size: Approx. 5mm/0.2in Leg Length: Approx. 31mm/1.2in Package List: 50 x Photoresistor Package List 50 x Photoresistor