1.Forward Voltage:1.8~3.6V 2. With CE approved Photo Diode LED Specifications: Photo Diode LED : 1.Forward Voltage:1.8~3.6V 2. With CE approved Photo Diode LED: 1. Emitted color: White,Warm White, Red,Yellow,Blue,Green are all available 2. Operation Temperature:-35~+60°C; storage Temperature:-35~+60°C