The Firefly LED Light turns your bottle into a nightlight or reading lantern. Clever use of light diffusing through liquid makes this work its magic, which is neato indeed. $21.95 liquid and bottle not included.
The Firefly’s unique design allows it to be used right side up, upside down, or hanging from the nearest handy branch. The unique lid design contains an integrated LED light which spreads a warm glow throughout the bottle. It has variable light levels so you can have a nightlight for stormy nights, or a reading light for enjoying your latest read; the control is at your finger tip! The electronics are in a separate sealed compartment, so there’s no risk of water or juice gumming up the works! Compatible with all standard wide mouth bottles.