Bought new and used twice only. Nothing wrong with it at all and I still have the unopened serum bottle (still with plastic seal). From the web: Known as the instant, non-invasive face lift, the Pure Lift Face by The PureLift Lab is the most advanced electrical muscle stimulation tool on the market. Powered by patented triple-wave technology, the device delivers powerful randomized electrical impulses to activate and elevate the facial muscles, giving the appearance of a firmer, more youthful-looking face in as little as 10 minutes. How the Pure Lift Face triple-wave technology works: First wave = low frequency to deliver an anaesthetic effect Second wave = mid frequency to target the dermis layer of the skin Third wave = high frequency to reach deep into the facial muscles https://usa.facegym.com/products/facegym-pro