We saw these at a restaurant in Aqaba, Jordan and just had to have a set. Each time you flip them over they change the color they glow. One of the choices is constantly varying color of the light that shifts through the rainbow. Hold it upside down for 10 seconds and they turn off.
When you're not using them store them on their charger stand and they are ready at a moments notice for any event.

They are plastic. Tough. Tolerate being left in the rain all night long.

If you're looking for a fun conversation piece/decoration this may be just what you need.

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