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Some come with remote controls, so you can direct them to the exact spot you want them to clean from the comfort of the sofa, and generally the more expensive they are, the more cleaning modes they have.
The priciest robots have up to six modes, including auto, where you can programme it to move around a space until it runs out of battery; turbo, which is the most powerful mode and picks up the most dirt and dust; and spot cleaning, where you can get it to focus on a particular area.
They don’t claim to be as good as your standard household vacuum cleaner when it comes to suction and dust capacity, so if that’s all you care about it may be better to buy a good upright vacuum cleaner.
But they are a convenient way of keeping your floors looking spick and span with minimal effort.
It’s simple to use – you leave it to charge and then press the (only) button to get it going.
It works its way methodically around your home and if it gets stuck on rugs or shoes, it turns off, navigates its way back to safety and starts again.
It didn’t get stuck on the large rug in the middle of our testing room, which was a problem for some.Sweeper brushes stick out from the side and sweep in dust and dirt to be sucked up, whereas brush bars live underneath and work to suck up dirt from floor surfaces.So before you buy, think about what your priorities are – do you want good suction, have lots of tight spots around your home that need cleaning, or obstacles that will need avoiding?There are no accessories such as virtual walls but there are two replacement sweeper brushes.
The robot works by bounding along the floor (it almost looks like it bounces) until it detects a wall or piece of furniture, after which it will change direction.
Each robot vacuum cleaner will also come with an array of accessories.