LIFETIME GUARANTEE means that if the timer fails, simply contact us, return it to our warranty center, and we will fix it or replace it. Regardless of how long ago you bought it, we will fix it or replace it. Lifetime guarantee limited to the original purchaser. Customer pays shipping to us, we pay return shipping. This guarantee is effective only in the United States and it’s territories, AK & HI. The guarantee is void if the AAP guarantee sticker is absent, if the cover is removed, if the timer is tampered with in any way other than what is necessary for installation, if a part (other than the core) is not returned as requested, if the buyer fails to complete the return within the specified time, or if the transaction is challenged in any way.