Some vacuums are so costly as a result of their advanced functions. Plus, many accessories and attachments are readily available for your various requirements of cleaning. The features may be HEPA filters (High-Efficiency Particulate Air), digital displays, laser dirt sensors, automatic adjustments of height, and indicators for the full bin, to name a few. Accessories and attachments may include an accessory bag, pet hair removers, dusting brush, crevice tool, special cleaning heads, etc.