This is a bedside water glass with a tilt switch. It stands upside down on the table to prevent dust to go inside. When user wakes up at night to drink water, he turns down glass and tilt switch gets activated to lighten the LEDs which are embedded bottom of glass. So glass turns into a lighting unit which eases pouring water from carafe at dark. After drinking water user turns upside down glass again to switch off light and keep glass clean.