The pen can be used for pain treatment if he finds funktioniert.Dieser pin only the stimulation points but the stimulation effect tingle to tweak the accounts for the effect does not occur. Cause: the battery 2x 2025 = 6V is too weak .Also new full batteries will not out.If the device with 2x 2032 = 6V is operated, it goes schwach.Aber these are broad and do not fit into the Batterieschacht.Hervorragend it comes with 7,5Volt externally fed! Had five years of the same device Medisana, which worked well !! Worse is the reaction of Pearl Customer Service: It is offered to me to deliver to spare, on my objection to send a certified device, the answer is "all items lying in the camp were geprüft.Das would be impossible and it was in my case also nicht.Also come back a device which would have to be exchanged again .The technical customer service informed by mail there is no experience with the Teil.Also is the next customer to buy the machine and have the same trouble. My suggestion discount and waiver of guarantee is not accepted. (If it was rebuilt) you are willing to Rückerstattung.Aber not being processed because my reference to the malfunction, I renounce the future to buy other products of this customer as a longtime manufacturer Pearl.