Also, make sure you buy extra gel for this! It only comes with 2 little containers of gel, and you will be going through a lot of it. Especially while figuring out how to use it properly. Here is a link to the gel that I bought.
I meant to post this link recently but forgot - I've been using the pen in the link below for years on my face and neck for what might be occipital neuralgia - love it, beats painkillers into a cocked hat, much more effective -no gel required either. Only place you can't use it is inside the eye socket.
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Cefaly Device - has anyone tried this?!
Vitamin D3 has cured my migraines
Second Hand Cefaly Device
A mere vitamin deficiency was the culprit, who would have thought that. 
