ASUS has launched a new mouse that comes with an built-in fragrance compartment that can be filled with aromatic essential oils. We don't know why you'd want a mouse that's also an oil diffuser, but,

If you were paying attention to CES this year, you may have come across the Asus Aidol 14 Air Fragrance Edition’s curious gimmick: a magnetically-attached oil diffuser in the lid that emits the aroma of essential oils once the laptop heats up.

As for how the mouse emits fragrance—well, it's not that complicated. There's a cavity at the bottom of the mouse that holds essential oil. Fill it up, and the fragrance will passively diffuse from the mouse.