Slow Color Change LED Base for DIY Centerpieces create an atmosphere like no other. Perfect for event decorations, weddings, office and home decor, these Vase and Bottle Lights bring a hypnotic and lovely feel to any occasion.To activate your LED Base, just set your bottle or vase on the piece and the pressure from the bottle will activate a slow color changing light effect. Take the bottle or vase off and the LED Base will turn off. LED Color: Red, Blue, Green. Diameter: 3.65" Slow Color Change LED Base for DIY Centerpieces comes ready to use with 3 AAA Batteries