... return them to us for replacement or refund.3.If the items is defective, pls notify us ... within 3 days of delivery.4.Any items must ... ,such as Integrated Circuit,Transistor,Semiconductor,Single Phase Bridge ,Diode Rectifier power,SCR Module, Audion products, Capacitors, Linkers, Resistors and ... 1 working day after the payment reach us.3. We ship it to you by UPS/DHL ...