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A set of four effects stickers, pre-programmed with one each of blink, fade, twinkle, or heartbeat lighting effects. Craft effects are the simplest way to add dynamism to any project - just connect power and ground, and the sticker generates a lighting effect. Works with voltages from 3V to 5.5V, so you can build wire-free projects using coin cells or power up with a 5V power adapter for extra brightness. Each set of four craft effects come bundled with a handy drawing stencil to help you plan out complicate circuits.