Product Description: Quantity: 2pcs Color: multicolor Different Lighting Modes Light Up Coaster: Constant Red Light, Constant Green Light, Constant Blue Light, Colors Slow Flashing, Colors Quick Flashing, Constant RGB Light. Multipurpose Acrylic Coaster - The USB rechargeable light up acrylic coaster can satisfy your needs of different occasion, such as party, wedding, cocktail party, dinner party, birthday party, etc. Ideal for home, bars, KTV, Restaurant, clubs, etc. Easy to Use: The drink coasters Diameter 10cm/3.94 inch, Long press the switch at the side to turn on/off the led coaster, shortly press it to change the light mode. IP65 Waterproof LED Coaster: The LED rechargeable crtal coaster made of high quality acrylic material for durability. Environmentally friendly materials, non-toxic, IP65 waterproof design, safe to use. Creating a cool and amazing atmosphere. USB Rechargeable Coaster Lights: Powered by a 400mAh lithium rechargeable battery which allow for 8-10 hours of working use (depend on setting) per single full charge.