In order to work correctly, it needs 4 things:1. Regulated 9v output. Check2. At least 1,200 or so amps. Check3. Tip positive polarity. Doesn't say.4. Proper size tip - 1.7mm x 4.0mm. Says 1x3, which seems unlikely.So it might have the right tip/polarity, and it might not. That's the problem with ebay - they don't tell us what the tip size is in most cases.