Most items are BENCH TESTED where applicable. Any claims for a defective unit must be received by our company in writing prior to 30 days from the date of invoice.There are NO EXCEPTIONS permitted! Should any questions or concerns arise, we are more than happy to work with you to find the best possible solution. Should there be an issue, we kindly ask that you. So we have the opportunity to work out a solution together. We strive for excellence and your 100% satisfaction is very important to us!