Is this headlamp good?

Hi everyone,

I wonder if anyone here got one of this type of headlamps?

Is this headlamp any good? Has anyone done a review for this type of headlamps?

Also, I would like to know how to replace the built in battery? Has anyone tried to open it up?

Thanks for your feedbacks and comments.

Its not for humans. But not bad as dog’s collar. Some review

1 Thank