It seems like they just used the same aluminum that goes for 7.
Compared it to original iPhone 7 and its probably in halftone to brown.
Buttons and sensors work perfectly.
This Awesome Mod Transforms Your iPhone 5s Into An iPhone 7 Mini
An iPhone 5s user thought that buying an iPhone 7 now is not a good idea. Hence, he thought to transform the old iPhone 5s into the new product.
