WelchAllyn Braun Manual Del Usario página 13

Guarantee
This product is guaranteed for 3 years from date of purchase
against material and /or workmanship defects. These will be
eliminated either by repairing or exchanging the appliance as we
may choose. All other claims, including for damages, are excluded.
Service under the guarantee does not affect its expiry date.
Claims only valid in countries where product is officially sold and
if accompanied by a proof of purchase.
Claims arising out of the sales contract with the vendor are not
affected by this guarantee.
13