Barsys Smart Coaster System Used a handful of times but in excellent/like new condition. Comes with instruction manuals and box. An expert mixologist is always at the ready with this ingenious coaster system. Simply place the included mixing glass atop the Bluetooth-connected coaster, select your drink and follow the instructions on the Barsys Coaster app. The coaster changes color to signal when to start and stop pouring each ingredient. Bluetooth-connected system lets you make fresh, expertly crafted cocktails anywhere. Features electromagnetic mixer that automatically shakes or stirs cocktail as you add ingredients. Access to Barsys app library includes thousands of cocktail recipes. Made of durable food-grade polycarbonate.