How do you create the world's best high performance light up yo-yo? By combining the popular FH Zero design with Pulse 's LED light technology! FH Zero with Pulse Technology features a wide/flared shape, recessed response system, and LED light technology that blinks, pulses, and changes colors as well as patterns as it spins! Attach the included LED light up counter-weight to perform extreme in the dark counter-weight tricks! Requires (1) LR1121 button cell battery (included). For children ages 8 and up. WARNING: CHOKING HAZARD - Small parts. Not for children under 3 years. Material: Plastic, Steel, Cotton, Electronic Components. Dimensions: 2" L x 2" W x 2" H Weight: 0.13 lbs.