The vac has a built-in infrared sensor to help evade obstacles and to avoid falling down stairs or off ledges of any kind. No one wants to come home, expecting a clean apartment only to instead find a half-clean one with an overturned robot sitting at the base of the stairs.

Right now, the Afnop Cordless Vacuum has a deal and a stackable coupon, bringing its price down to $120. More than 3,000 customers have bought it in the past month alone, and revi