Helps Relieve Stress and Easy To Carry, Small, Simple, Discrete and Fun! Also effective for Focus and Deep Thought. Hold spinner in one hand and use the other hand to spin it rapidly using small continuous strikes to keep it spinning indefinitely with practice. Spinners can be spun only using the fingers of one hand to stop and start spinning. Ideal size suitable for adults and children. Suitable for children 3+. Features on/off switches to activate LED lights. Measures 3" x 3" x 1/2" Weighs 1.1 oz. Replaceable AG3 batteries.