It lights up just as advertised. Do wish it had more colors though.

I bought one of the astro lounge cups at PAX East and have been using it heavily since. It eventually developed a slight leak. So rather than buy a whole new cup (when I already have others) I decided to get this coaster and use the cup as a display piece. I was expecting it to barely be visible through the cup and it to be a permanent on/off. But the lights actually shine beautifully through the astro lounge cup and these coasters have a very simple but very clever way of only turning on when the cup is on top.

I have recently gotten into buying various shackers and this just adds a cool lighting effect for each one. Very happy with the product and it's durability.

This lil thing does it all, so long as “all” means underglows a shaker when you set one on it! You like colors? This thing’s got COLORS. Blue colors, and red colors, and green colors, and even MORE colors. What a thing to have! Shine bright like a coaster. That’s what Rhianna says.

The coaster kept my desk dry and my cup lights up