We are a dedicated company in providing the best quality tens devices and we stand proudly behind all of our TENS , EMS , and Ultrasound products and are confident that we are supplying our customers with only the best and most cutting edge technology. In fact, we are so certain of the quality of our products that we happily offer warranties ranging in length from six months to two years depending on the specific product. Our limited warranty covers any manufacturer defects* that may occur with any unit providing complete satisfaction to our customers. All defective units will be inspected by our quality experts upon arrival so that we may make the final determination regarding the condition of the unit.