1、RESPONSE TIME: With a response time of 20ms in bright light and 30ms in dark light, this photoresistor ensures quick and accurate light sensing. 2、PACK OF 50: The set includes 50pcs of 5mm GM5539 photoresistors, featuring a leg length of 31mm, providing ample supply for your projects. 3、20 LIGHT SENSORS: The photo light sensitive resistor has 20 light sensors, ensuring stable and reliable light measurement. 4、SEMICONDUCTOR MATERIAL: The photoresistor is made of semiconductor material, with its conductivity varying with changes in light strength. 5、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.