The federal law mandates a three business day return period, which Enagic USA has established as its return policy. Under extraordinary circumstances requiring company approval, strict guidelines apply: 1) a full refund minus shipping fees for returns within 3 days of receipt; 2) a restocking fee for returns between 4-30 days; 3) no refunds after 30 days. The customer must pay return shipping costs and agrees to the policy terms.