I often spot these units on ebay auctions. It has a good parts and seems to be a good design. The seller/manufacturer(from oriental Asia?) is even providing a warranty. It's certainly not a large manufacturer and he's realy more like a hobbyist so today you've got this warranty but tomorrow you might not. I'd suggest asking a circuit diagram for this unit before you acquire it in case you'll need to deliver it to a technician.
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