From Gardener's Supply (

By day, this dragonfly appears to hover over your garden. At night, its crackle glass body glows with color-changing LED light. Easy to install, easy to use. Simply place the dragonfly stake where it will receive full sun during the day and it will automatically light up at dusk and glow for 4 to 6 hours. Powder-coated and hand-painted steel dragonfly with crackle glass body, mounted on a sturdy steel stake.