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![Amazon.com: [initeq] 2-Pack NE555 555 Timer Breakout Module Adjustable Square Wave Pulse Generator Shield : Cell Phones & Accessories](https://m.media-amazon.com/images/I/81JezLbhq7L.jpg "Amazon.com: [initeq] 2-Pack NE555 555 Timer Breakout Module Adjustable Square Wave Pulse Generator Shield : Cell Phones & Accessories")