I bought a tens unit through Walmart that they sell drive medical tens units and after one month of use it stop working and I called them and they said they would not honor this item because they no longer make it and discontinued this item and so for every one that wants to buy from them buy beware they will not honor their product if it stops working and will not give u a refund if they do not sell the item any more that is a scam and wrong buy beware.