
This is a single product line rather than a broad range: one USB powered electric eye mask. It draws power from a laptop, a wall adapter or a portable battery, which means the warmth is generated by the mask itself instead of being loaded into it beforehand.
People who want the same routine at the same time every day tend to get on well with a plug in mask, because there is no kitchen step in the middle of it. It is also a reasonable pick for an office, where a shared microwave is not always somewhere you want to warm an eye mask. If you travel light and often, a microwavable or gel mask may still be the more portable choice, since it needs no cable.
Use the heat settings and session lengths in the manufacturer's instructions rather than assuming they match another mask you have owned. Keep the surface that touches your skin clean and dry, and inspect the cable and connector from time to time as you would with any powered accessory.
Heat masks are one part of a wider routine that often includes lid cleansers and drops. If you are working out what belongs in yours, that is a conversation for your eye care professional.