The above instruction card explains the simple steps to building your Hikaru holiday card.

Dazzu is a flexible LED strip that was incorporated into our design of the Hikaru.
There is no sewing needed and it works with a CR2016 thin battery.
It can also be reused and reprogrammed to control the twinkle pattern of the LED's.

MoMA Website with added page where users can reprogram their Hikaru LED's.