Well, here are the most important points you need to pay attention to:

Suction Power: In a handheld vacuum cleaner, its main function is to clean effectively, so suction power is crucial. Check the wattage or air watts (AW) as they indicate the cleaning power. Higher suction power is necessary for removing more "difficult" residues and achieving deeper cleaning.

Battery Life: For cordless handheld vacuum cleaners, battery life determines how long you can clean with one charge, the autonomy. It would be good to look for models with a long battery life, ideally offering at least 15-20 minutes of continuous use. Also consider the charging time, as some models charge quickly, while others may take several hours.

Weight and Ergonomics: It goes without saying that handheld vacuum cleaners should be lightweight and easy to handle. A well-balanced, ergonomically designed vacuum will reduce strain on the wrist and hand during prolonged use. Check the weight specifications and handle design to ensure maximum comfort.

Dustbin Capacity: Handheld vacuum cleaners have smaller dustbins compared to traditional vacuums or stick vacuums. Make sure the capacity meets your cleaning needs. A larger dustbin means fewer trips for emptying, making it more convenient for prolonged cleaning cycles.

Filter Type: Effective filtration is vital for maintaining air quality and ensuring the longevity of the device. The best thing you can do is look for models with HEPA filters, especially if there are allergy issues, as they can trap fine dust and allergens. Some vacuum cleaners also offer washable filters, which are cost-effective and environmentally friendly.

Attachments and Accessories: Some handheld vacuum cleaners include additional different attachments that can definitely enhance its versatility. Some of the most common ones are crevice tools for narrow spaces, upholstery brushes, and pet hair attachments. Consider the types of surfaces and areas you will be cleaning to determine which attachments are necessary for you.

Noise Level: Handheld vacuum cleaners can be noisy, which can be annoying, especially in households with small children or pets. Check their sound intensity (dB). Models with lower dB operate more quietly, providing a more pleasant cleaning experience.