Some models support smartphone app control or remote adjustment and note Wi‑Fi compatibility or companion-app customization, allowing you to change sounds, color, brightness, and schedules remotely.

Many units list volume control and sound-masking as features. Reviews note they can effectively mask household noise with adjustable volume levels and sounds designed to run through the night.

Power options include USB/USB charging, direct AC (plug-in), and battery power—either built-in rechargeable lithium‑ion batteries or replaceable coin-cell batteries (for example, CR2032) in some models.

Nightlight options range from a dimmable warm-amber glow to multi-level brightness (for example, three levels) and, on some models, multi-color LED choices such as seven-color options.

Compact models listed range roughly from about 4 inches to 8 inches in height, with footprint widths around 2.19–4.6 inches based on the provided dimensions.