Our switch adapted Mini Mesmerizing Volcano Lamp has been adapted to accept a standard switch (sold separately) or it can be used without a switch. When you press your switch, the colored 'lava' balls flow from the volcano up into the red lighted water and back down again. Nice for increasing visual attention or just as a relaxing activity. An awesome addition to any sensory room. Measures approximately 5.5" x 3" x 3" and requires 4 AAA batteries (not included). Small parts not suitable for children under age of 3. Please note this item cannot be returned once it has been filled with water unless there is a manufacturers defect.