EXKAL unless expressly stipulated to the contrary included in the offer or the acceptance of the order, guarantees the products it has supplied in relation to defects in materials, manufacturing or assembly for a period of twelve (12) months from the date of reception, whether explicit (overcoming the acceptance tests, agreed between the Company and the Client and sending a written acceptance of the supply), or tacit fifteen (15) days (after sending the Client, without written communication to the Company indicating any disagreement) or eighteen (18) months from the date on which it is notified that the supply is available for shipment, whichever occurs first.