s: Plasma ball for more fun and interaction. This plasma ball is a great decoration for your bedroom, living room, office or anywhere else! It will create a super cool science-like atmosphere. It's part science, part magic and all fun! Just slide the switch to the "ON" position, this plasma sphere reacts to your touch and sends light rays wherever your fingertips go, very beautiful in the dark, which nicely shows beautiful scientific phenomenon. If your child is the curious type who are always impressed by all things science, they will be completely enthralled by the electric ball. Help them discover the secrets of plasma in a way that is larger than life and completely safe. The magic plasma light will arouse children's curiosity, bring children's scientific imaginations to reality. When the ion ball works, a field similar to a point charge is formed around the electrode in the center of the ball. When the ball is touched by the hand, the distribution of the electric field and potential around the ball is no longer uniform and symmetrical, so the glow becomes brighter around the fingers, and the joint arc swims and twists along with the hand. , and dances with the movement of the finger. Specifications: Material: ABS + glass Size: 8*14 cm Black color Power : USB cable plug-in/4 AAA batteries ( not included) Product list: 1st plasma ball lamp 1st USB cable Notes: Please allow slight dimension difference due to different manual measurement. Please note that a slight color difference should be acceptable because of the light and.