Features:1. Gold plating process, it has long service life2. Manual welding, it is sturdy and durable3. Good electrical conductivity and low resistance4. The fixing holes are uniform in size, gold-plated and edging, and the fixing is smoother and not jammed.5. There are labeling pins on the printed circuit board, which is easier to use and understand.Specification:Condition: 100% Brand newItem Type: Extension BoardSize: Approx. 58 x 26mm / 2.3 x 1inPitch / Fixing Hole: 2500x1000mil (36.5x25.4mm) / 3mmInterface: micro:bit gold plating, 2.54mm pinOptional Color: Red, Yellow, Blue, BlackPackage List:1 x Extension Board1 Set of Straight Pin Headers1 Set of Angled Pin Headers(need to weld by yourself)