Rechargeable batteries (typically USB-powered) with varying capacities (e.g., 2000mAh-8000mAh) offering 4-27 hours of runtime depending on speed settings .

Flexible mounting options like bendable tripod legs or clamps to attach to strollers, cribs, or car seats .

Safety designs such as small grill holes/bladeless options to prevent finger injuries .

Adjustable speeds (typically 3-4 settings) including natural breeze modes .

Lightweight builds (usually under 1.5 lbs) with compact dimensions for portability.

Additional features like LED lights, oscillation, or white noise modes in some models .