3 years & up. Building blocks that glow! These beautifully colored building blocks are different than the traditional building blocks because they are built from a powered base and every block lights up as you stack them. There are endless possibilities to fulfill imagination and creativity since there is not a wrong way to stack the blocks. Use Light Stax(R) as a custom night light with 3 light modes: solid, flashing, and fading. All three modes have a 15 minute auto shut-off. This set offers you the opportunity to build a museum quality sculptural masterpiece. Set includes 102 Stax in 6 colors, 1 power base, and 1 USB power cable. 100% compatible with other building blocks of similar size. One power base via USB lights up hundreds of Light Stax(R). Requires 3 AAA batteries (included).