1. Wide detection range: This product uses to detect the 240-370nm photodiode UV light range, covering UVB and most UVA spectra. 2. UV Sensor: This product has a true UV sensor instead of a calibrated light sensor, so you can convert the voltage to UV index by dividing the output voltage by 0.1V. However, the UV LED on this product is 400nm. Do not use it if it is outside the range of this sensor. 3. Signal Amplification: The signal level of the photodiode is very small and at the nano-amp level, so this product amplifies the op amplifier to amplify the signal to a more manageable voltage level. 4. Less Power Consumption: This product only needs + 2.5V-5.5V power supply to supply power. When the sensor detects , the voltage increase. 5. Simple Operation: This product is easy to operate, it just does one thing and provides analog voltage output without a complicated I2C setup program. This sensor allows you to update projects that use photovoltaic cells. Due to the high rejection ratio of infrared radiation, the sensitivity of the ambient light sensor is close to the sensitivity of the human eye. Specification:3PCS Color: Material: plastic Package Contents: 3 x ALS-PT19 Analog Light Sensor Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.