Not sure yet. [SEP] I don't know if this is helping my hair regrowth but, I feel like it's helping my spider veins. It's easy to hold even for extended periods of time. It's not a rechargeable product. It must be plugged in while using. It is painless. I don't wear the super dark glasses. I just close my eyes. I use on underarm too. I will keep it up, I'm just sorta lazy.