# Implementation Features

DUO changes its appearance to accompany various events in the life of the holder. There are three main types of change:

1. [the holder presses his/her own button to change](/duo-nft/implementation-features/optionally-specified-platforms.md)
2. [automatically changes according to the time and region set by the holder](/duo-nft/implementation-features/automatic-change-by-api.md)
3. [changes in accordance with the movement of the held address](/duo-nft/implementation-features/change-by-specified-tx.md)

<figure><img src="/files/f26FVBzzk4KmNZywCvnB" alt=""><figcaption></figcaption></figure>

Below we will explain these three in a little more detail.


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