AUCH 1Pcs High Borosilicate Glass Magic Flashing Static/Ionic Ball, Rainbow Color Dimension(W * H): approx 13.9cm * 10cm. It can purify air and absorb nicotine and formaldehyde. It adopts electrostatic induction theory, when you put hand on ball, static light can move with your hand. When you put hand on ball, static ball around hand is brighter than other places. It is a good room decoration and it is also a good air cleaner.