I use the heat settings at night before applying my eye cream. I use the cold setting to depuff my face in the mornings. There are multiple settings to increase the heat or coldness.
TheraFace Depuffing Wand - Therabody
I use this when I do my at home facials. It's basically a mini hydro microdermabrasion machine.
GLOfacial Hydro-Infusion Deep Pore Cleansing Tool - BeautyBio
I use this when I do my at home facials to open my pores before I put on a face mask.