Light Stax are a fun and addictive construction system. The blocks light up as you use build! Great for all ages, as a toy or an executive desk gadget. Light Stax Building Blocks are 100% compatible with classic construction block products of similar size, opening up a world of new construction ideas. One smart base can supply light to more than 100 light stax building blocks on battery power and over 1000 light stax building blocks on USB power.