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1. The surface of the coaster is white, printed with the switch sign, and the diameter is 6cm
2. It contains 4 LED, with multiple light color combinations -- 4 red, 4 green, 4 white, 4 blue, or 2 red, 1 blue and 1 green, and 4 light modes: fast flash - slow flash - normally on - off
3. Including 2* CR1220 batteries, with tear off sticky paper on the back, and the coaster can be stuck on the bottom of the cup
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