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because the LED has a positive and a negative lead and will not light if they are the wrong way around and secondly
Light weight (under 4 grams without antenna)
Factory balanced
Mini small solder less breadboards
Hard anodized finish
Soldering Iron 25v lithium polymer battery because the LED has aA soldering iron is a hand tool used in soldering. It supplies heat to melt solder so that it can flow into the joint between two workpieces. A soldering iron is composed of a heated metal tip and an insulated handle. Heating is often achieved electrically, by passing an electric current (supplied through an electrical cord or battery cables) through a resistive heating element Solder melts at approximately 185C (365F). Soldering irons are designed to