Laser Pegs MPS Robot Series Includes 2 Laser Pegs, 61 construction parts, a Mobile Power Source and Model Instructions Build the light up Worker Robot and 3 more light up models: Helper Bot, Android, Mini Android Once connected to a power base, each Laser Pegs shape feeds the next to light up as you build 3 Light Settings: On, Fast Flash, Slow Flash; Laser Pegs' unique design makes them compatible with other major construction kits 100% recyclable, LED life expectancy of 100,000 hours or 11 years, 90 day no questions asked warranty