1、Gold plating process, it has long service life 2、Manual welding, it is sturdy and durable 3、Good electrical conductivity and low resistance 4、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. Features: 1. Gold plating process, it has long service life 2. Manual welding, it is sturdy and durable 3. Good electrical conductivity and low resistance 4. 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 new Item Type: Extension Board Size: Approx. 58 x 26mm / 2.3 x 1in Pitch / Fixing Hole: 2500x1000mil ( 36.5x 25.4mm) / 3mm Interface: micro:bit gold plating, 2.54mm pin Optional Color: Red, Yellow, Blue, Black   Package List: 1 x Extension Board 1 Set of Straight Pin Headers 1 Set of Angled Pin Headers(need to weld by yourself)