Easy and attractive, these LED light enhanced beverage coasters from Philips illuminate your drinks with light and color. But don’t worry, unlike other light bulbs these LED light bulbs are cool to the touch therefore your drink won’t be heated. The LED Coasters are not only easy to use, but they are weatherproof and acceptable for both indoor and outdoor use with water resistant technology.
The use of battery operated technology makes it possible for the coasters to charge and then be relocated to other needed locations. The scratch resistant technology makes them easy for cleaning, to top it off simply tilt the coaster to turn it on, off and to change the color.
Source:
http://www.lightpublic.com/lighting-products/philips-led-coasters-led-technology-is-cool/