For portable bedroom humidifiers for shelves, useful comparison points include placement, dimensions, power method, capacity, controls and the specific functions represented by the search.
Catalog options relevant to this combination include Quiet Large Capacity Portable Humidifier, Compact Mini Portable USB Humidifier for bedside comfort, and Portable Crystal Aromatherapy Humidifier. Their exact specifications can differ, so use the individual listings for final product details.