This is your basic spool of leaded solder with a 63/37 water soluble resin core. 0.8mm gauge and 50 grams. This is a good spool for more advanced users that should last 3-6 months depending on how often you solder.
This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.8″, but it allows a typical continuous output current of up to 5 A.
This is an SST tracked robot platform equipped with 32-millimeter motors, a motor controller and a tethered remote. It has a pan/tilt camera with high power LED lights. This is a rugged treaded robot platform.