Review (4/5): happy vibing: )
I'm giving this product a 4 because, as others have mentioned, the battery back is a bit cheap. Of the 4-6 or so Fukouku massage gloves I've owned (left and right, small and medium/large), the wiring has failed on at least one. That being said, I buy them primarily for raves and music festival party favors, so they go through more wear and tear than they are likely designed for.
The vibration output is impressive for the size of the finger tip vibrators, about 3/4 of a square inch each x5, but I wouldn't expect much therapeutic benefit. This, in my opinion, is a novelty/sex toy, and for those purposes it works well... very well.
The battery life is around a half hour to a lil over an hour depending on the setting hi/low. Each glove requires 3 AAA batteries which install simply into a plastic pack, and fit into an elastic compartment inside the wrist of the glove. The batter pack stay secure even through dancing and arm flailing for hours. Also, I always bring an extra set of batteries or two per glove when I go anywhere with them.
I hope this is helpful, happy vibing :).