DIY Soldering 51 MCU Microcontroller Mini Development Board Parts Set Product Name : 51 MCU Mini Development Board Parts Set;Coil Voltage : DC 4.5-5.5V PCB Board Size : 85 x 72mm/ 3.3" x 2.8"(L*W) Material : Plastic, Electronic Part Net Weight : 65g Package : 1 x 51 MCU Mini Development Board Parts Set