4PCS 3x4 Matrix Keypad 12 Keyboard Module External Keypad Board for Microcontroller (12Key)

**Editorial Review** The 4PCS 3x4 Matrix Keypad has garnered a significant amount of criticism from users primarily focused on its Construction and functionality. While some users acknowledge the adequate quality of the keypad in terms of mechanics and electrical design, a recurring theme in the feedback is the incorrect pinout provided with the product. This discrepancy has led to frustrations, particularly for those integrating the keypad into existing Arduino designs, necessitating rewiring efforts that complicate the setup process. A central issue that many customers encountered pertains to the button functionality. Multiple users reported that the keys failed to provide continuity, attributing this issue to a film covering the contact pads that prevented proper connection. Although a few users managed to salvage their experience by cleaning the pads, they noted that this resulted in unreliable performance rather than a Consistent response. Worse still, the printed circuit board's Construction was heavily criticized. Users highlighted that the copper traces were prone to breaking during soldering, indicating poor quality control during manufacturing. This defect made it exceedingly challenging for users to create reliable connections without damaging the board itself. Overall, the feedback paints a picture of a product that suffers from mechanical and functional inadequacies, making it difficult for users to recommend it for reliable applications in their projects. **