Steam machine with steam controller.

Steam machine mid-poly model without turbosmooth, steam controller mid-poly model with turbosmooth.

Diffuse textures and panels in map channel 1
Bump and roughness textures in map channel 2
2k textures

If you are working in V-Ray version lower than 3.1, be careful, the materials in the BRDF section have Microfacet GTR (GGX). If your version is older than 3.1, the BRDF field will be empty. Choose Blinn, Phong, or Ward – whichever is preferable for you.

For Corona render, it is recommended to use version no lower than 1.5, as the glossiness of the materials is set with PBR in mind.