An explosive snap-on hands-free neck light ECHDC038 released this year.I found a description that it could be attached to a head on spap-on’s US website and tried it immediately.
It is difficult to shadow than to attach it to the neck, and it is easy to use because the light tip hung on both ears is linked with the movement of both eyes.
It is almost gone to bark the portable pen light in the mouth any longer.
It is a micro USB C type repeated charging type, and also has a remaining charge indicator.
Because it is compact and lightweight, it does not care about the battery weight behind it, and the continuous lighting time will not be a problem (up to 8 hours).
This is a similar product.