Hanging 4' from ceiling to bottom for the Medium and 3' for the Short. 11" in diameter. Powered by an impulse motor, totally quiet, whose batteries last more than 4 months with continual use. The Dancing Helix creates complex but rhythmical wave patterns to enliven any room with its calming dance. Impulse motor comes with Dancing Helix. The NOVA beads are opaque but with an iridescent shimmer as you would see as an oil slick. A powerful Feng Shui tool. Hang it in the corner of a room, turn it on and be amazed as its rhythmical dance commences, making visible the patterns of creation. Like watching the waves at the shoreline, your Dancing Helix has the power to both have a calming effect to all those who watch it and lifts the imagination to the Dance of Life present in the Helix pattern. Comes with 30mm leaded glass bottom pendant that when hung in the sun fills the room with rainbows.