The Davek Alert umbrella comes with a lifetime guarantee: If, at any time, you find any defect in workmanship, or the umbrella frame should fail to function properly, we will gladly repair or replace it at no charge (except shipping & handling). Due to the technology's dependence on use with compatible phones, this guarantee applies to the umbrella only (not the Alert app). If the damaged umbrella is returned to us without beacon chip, there will be a $15 surcharge to replace the chip. Guarantee valid for U.S. addresses only.