The face and neck set is by far the worst investment every made. (1) One was short circuiting. It took them more than 3 months to honor their guarantee. (2) Second one had bad battery -- NO QUALITY CONTROL (3) Third one only had YELLOW LIGHT -- no red. (4) The third one also had a dude battery pack. (5) There is NO CUSTOMER SERVICE NUMBER and they give you the runaround via email setting up time in Europe to speak to you in the US. (6) Another review site that they use has the company broken out into several entries that all have half or more negative reviews -- several hundred 1-star reviews in the last 6 months. Total junk and waste of money, plus they keep 10% of the purchase price when refunding DEFECTIVE MASKS. It's a scam.