Yes it has a "needle". It's a plastic filament, and it's inserted inside a metal needle that gets removed with the applicator.
It was actually entirely "painless" to apply. I braced myself, hit the button, and went "did it happen?" and saw something stuck in my arm. 100% couldn't tell. THAT SAID, I spent the next 3 days going "ughhhhhhh my arm hurts" so I must've hit something. I squished the flesh around a bit, and massaged my arm and it stopped after a few days. I can't tell if I got unlucky, or if this is just what "new thing in my arm" feels like.
It was actually entirely "painless" to apply. I braced myself, hit the button, and went "did it happen?" and saw something stuck in my arm. 100% couldn't tell. THAT SAID, I spent the next 3 days going "ughhhhhhh my arm hurts" so I must've hit something. I squished the flesh around a bit, and massaged my arm and it stopped after a few days. I can't tell if I got unlucky, or if this is just what "new thing in my arm" feels like.