1.LDR photoresistor sensor with good price 2. fast lead time 3.more 10 years factory experience PhotoresistanceWe do CDS/LDR Photocell more than 10years, our quality and technology is top in China. Many types for you to choose, 3mm,4mm,5mm,6.5mm,7mm,12mm,20mm,25mm, and many types.