GB 4000 MOPA frequency generator. Im the second owner, purchasing it in 2016. I used it on and off for a year, and kept it in storage. Updated it with AAA. Used it for Lyme disease. This has the new updates. Ill be taking it down by May 1st. The item “GB 4000 MOPA frequency Generator” is in sale since Sunday, March 15, 2020. This item is in the category “Health & Beauty\Natural & Alternative Remedies\Electrotherapy Devices”. The seller is “waskbarba” and is located in Eugene, Oregon. This item can be shipped to United States.