✅ Key Features for a 3‑in‑1 Cordless Vacuum Cleaner

1. 3‑in‑1 Versatility

   • Converts between stick / upright mode, handheld mode, and sometimes blower/inflator or specialized attachments.

   • Detachable parts to clean stairs, car interiors, upholstery, tight corners, etc.

2. Cordless / Battery Powered

   • Lithium‑ion battery for better life and lighter weight.

   • Good runtime (e.g. 30‑60 minutes in lower or eco mode).

   • Fast recharge time.

3. Wet/Dry Capability / Blower Function (if applicable)

   • Able to handle dry debris and wet messes (spills), or have a blower function to blow away dust or dry debris.

4. Strong Suction Power

   • High suction force to pick up dirt, pet hair, large debris.

   • Motorized or powered floor brush for carpets & rugs.

5. Multiple Speed / Power Modes

   • At least two speed settings (standard, boost/turbo) so user can balance runtime vs. cleaning power.

6. Good Dust / Dirt Capacity

   • Decent sized dustbin (e.g. 0.4‑1 L) so fewer interruptions to empty.

7. Filtration System

   • HEPA or multi‑layer filters to trap fine dust, allergens, pet dander.

   • Washable or easy to clean filters.

8. LED Lights & Visibility Features

   • LED lights on the nozzle to show hidden dust under furniture, beds, etc.

9. Ergonomic & Lightweight Design

   • Comfortable to hold in handheld mode.

   • Lightweight overall so easier to carry up stairs, move around, etc.

10. Attachments & Tools

    • Crevice tools, dusting brush, motorized mini brush for upholstery or pet hair.

    • Tools for wet/dry tasks if supported.

11. Quiet Operation

    • Noise‑reduction features; quieter operation in normal mode.

12. Battery / Charger & Charging Features

    • Removable battery or easy‑to‑charge dock.

    • Indicator showing battery level.

13. Durability & Maintenance

    • Washable / reusable filter.

    • Easy to empty dust container.

    • Materials that resist wear.

14. Lightweight & Compact Storage

    • Foldable or compact enough to store easily.

    • Wall mounting bracket or stand for storage.

15. Safety Features

    • Overheat protection.

    • Protection against liquid damage (for wet mode).