There is a two-year guarantee with the dust remover.
The watch comes with a year’s guarantee.
This TV set is guaranteed for three years.
There is a+月數或者年數+guarantee with...……保修期為+月數或者年數。或者用It has a+月數或者年數+guarantee.表達也是可以的。如果想表達在保修期內，可以用under guaranty / warranty / maintenance 來表達。例如：A new refrigerator is still under warranty.這個新冰箱仍在保修期內。We will repaid your car free of charge because it still under maintenance.我們將免費替您修理汽車，因為它仍在保修期內。
This new washer carries a two-year guarantee.
We offer a life-time warranty.
We provide free delivery and installation, along with a 3-year warranty that covers parts and service.