Simple LED toy kit Posted on February 8, 2015 by onboard Simple LED kit for beginner Features Easily make your LED light. Beautiful Pink 5mm LED. Build Kit include 1 x 5mm Pink LED 1 x 1k resistor 1 x CR2032 battery holder (Not include CR2032) 1 x PCB Bend the resistor lead. Solder the resistor. Solder the battery holder Check the LED’s polarity. Long lead is +(PLUS). Cut the battery lead for safety. Insert the battery.