Smartek ST-25 - Manual (Page 6)

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 without 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.
Send your package postage prepaid with a copy of your
proof of purchase. You will also need to enclose a letter
explaining the nature of your difficulty in detail. Please
allow 2-4 weeks for return shipping.