Smartek ST-70 - Manual (Page 7)

6 MONTH LIMITED WARRANTY:
This product has a warranty for 6 months from provable
date of purchase against defects in material and
workmanship.
During this period such defects will be repaired, or the
product will be replaced at no charge.
This warranty does not cover damage caused by
misuse, negligence or improper installation. Warranty is
also invalid in any case that the product is taken apart or
serviced by an unauthorized service station.
TO CLAIM
Send your package postage prepaid with a copy of your
proof of purchase. You should enclose a letter explaining
the nature of your difficulty in detail. Please allow 2-4
weeks for return shipping.