I have the Bajaj Pygmy Go (It’s a variant on the same link you posted) and it’s quite good.
A little on the bigger side but fits my laptop bag perfectly. Power of the fan would be a trade off I guess the smaller you go for. I believe the Bajaj Pygmy is quite balanced in that sense.
No experience, I like the gimmick. I do have positive experience with the USB powered tiny fans, in offices with horrible AC systems - they save lives. There are better quality neck fans, with much better reviews, but no personal experience :
For such portable fans, better visit Dmart. They have couple of models which perform so good yet very cheap compared to all the other online ones that don’t justify their price at all.
Maybe I’m replying too late. But checkout the brands “gaiatop” and “frsara” on amazon India. They have a lot of options for you to choose from. I got one with a suspension lanyard for my father who sweats a lot and wanted something to cool him off when he’s at his desk. It has been working well for over a year now. But be aware, these are mostly Chinese imports, so you won’t really have any warranty / after sales support.