The Flea Market LED Flashing Yoyo is fun for all ages. Bring back your old skills or learn something new! Flashing LED's make it fun to play both in the light and dark. Key Features Lights up and flashes as it spins LED light Requires 2 x LR41 Button Cell Batteries (included) Hours of Fun WARNING: This product contains a button/coin battery and is hazardous. Keep batteries away from children. Batteries can cause severe or fatal injuries in 2 hours or less if swallowed or placed inside any part of the body. Medical attention should be sought immediately if it is suspected the battery has been swallowed or placed inside any part of the body.