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Features Attribution→Durable &Super bright, Low heat&Energy-saving, Small size &Long lifespan. Wide Application:DIY LED Projects, School Science Experiments, Car Decorations, Signal Indicator,Electronic and Electrical Experiments, including Arduino Projects,etc. Package 200pcs 5mm led diodes Red: 20pcs,Yellow:20pcs,Orange:20pcs,Blue:20pcs,Green:20pcs. Purple:20pcs,Pink:20pcs,Cold White:20pcs,Daylight:20pcs,Soft White:20pcs1*Cooper Foil Tape1*Electronic cable1*3V Battery Wavelength Range Red:620-630nm,Yellow:580-590nm,Orange:600-610nm,Green:520-530nm,Bule:460-470nm, Purple:400-410nm,Pink:X:0.49 Y0.21,Cold White:8000nm,Daylight:6000nm,Soft White:3000nm Specification Head Type:Round Head Diameter: 5mm Head Material: Plastic Pin Length: 18 mm Max. Current: 20mA Voltage:2-3V Viewing Angle: 30 Degree Forward Voltage: R/Y 1.8-2.2V; B/G/W 2.8-3.2V Polarity: Anode (Longer Part) | Cathode (Shorter Part)