LED Mask Series 2.

"The Series 2 improves on an already good product rather than reinventing it: more LEDs (236 vs the original's 132), an added deep near infrared wavelength, a chin strap for better jaw coverage, an extra strap over the top of the head for a snugger fit, a smaller mouth opening for better lip coverage, and eye inserts instead of goggles. Dr. Anne appreciates the chin strap and top strap especially, since chin and jaw coverage was one of her main complaints with Series 1. But the eye inserts do not fit her well and the mask feels a lot brighter, so she has trouble watching TV or walking around with it on. It also costs more, 480 euros versus 360 for Series 1, and after using it for more than three months she does not notice a real difference in results compared to her old mask. For her, Series 2 is the better of the two if choosing between them, but she probably would not have upgraded from a fully functioning Series 1 since it is a big investment for a minimal difference in expected results."