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in other words
Color Red and grey
The board supports mini connectors to save on space and the 40 pin GPIO is unpopulated providing the flexibility to use only the connections your solution requires
push on push off
40W Hk-640 Mechanic Soldering Iron no cod in other wordsMECHANIC HK 640 Electric Soldering Iron External Heat Type Constant Temperature 40W Welding Pen Welding Maintenance Tool Take DIY projects to the next level with this powerful Electric Soldering Iron. Maximize accuracy and achieve lasting results for a professional finish. Unleash your power and get creative! Note: A small amount of white smoke will come out after the first use, usually it will disappear slowly after a few minutes, and it can be used