Watts are a means of measuring the amount of power that's put into the motor. However, because the output power or suction you receive at the end of the hose depends on the vacuum's design and efficiency, air watts, which measure the output power and suction, are considered a better means of comparison for vacuum cleaners. Remember however, a clogged filter will quickly impair ait watt performance.
A high wattage (input power) doesn't always mean better suction because the amount of this power that's turned into air watts (suction or output power) depends to some extent on the vacuum's design and efficiency.
When it comes to vacuuming small or awkward areas quickly and conveniently, there's nothing quite like a hand held vacuum. A cordless hand held vacuum cleaner knows no boundaries and with an endless list of uses, once you buy a hand held vacuum, you'll wonder how you ever lived without it.