I ordered a set of two and they arrived promptly and looked to be new and complete. After charging fully I noticed a bad crack on the side of one and the other would not turn on. I returned them and Overstock promptly replaced them. I also ordered another set since I had already invested in the boom headset that attaches to my helmet that the HS830 bluetooth fits in. I figure from 4 units I should get two that work, and the price is great. The four HS83O bluetooth units arrived. I checked them for defects and found (with my 10x magnifier) that all 8 screws (on the 4 units) that hold the cases together had been overtightened at the factory and had cracks at each screw hole. Also 1 of the units would not turn on. I will return the bad one for replacement and just put a little crazy glue on the cracks of the good ones. I would not recommend these as they all seem to arrive with cracked cases and the units seem fragile.