How do I (23m) tell my sister (23f) that her “self-defense” keychains are actually putting individuals in more danger?

Therefore my sister " Jill" (fake name obviously) started a small side-business selling self-defense keychains live! after the girl was mugged coming home from Uni a few months ago. Recently I was able to stop by and see her and she gave me one to give to my gf " Talia" (21f. )

Well Talia' s stuck near the frosty circle for another couple weeks intended for work so I' ve had the keychain sitting down around for a few days and am finally decided to check it out. Visually, it looks great! It offers the long spike factor, a personal alarm, seatbelt cutter, a whistle, a torch, door-pull, wrist strap, an AirTag holder (unofficial), and some pieces that look like container openers? (I' m not really too sure what they' re for and at this time I' m afraid in order to ask because the answers are so depressing)

Anyway, on closer inspection I noticed that the things i thought was metal at first was actually some kind of gleaming sparkly plastic or polymer-bonded. Ok, no big deal, this looks nice. I tested the seatbelt cutter upon some denim scraps I needed laying around and it worked well great! Even had a key to deploy a window-smasher, 10/10 no complaints there.

But then I tried the particular whistle… it was nearly noiseless. Ok, crappy plastic whistle, how about the little noise grenade then? Barely better. I actually left it ringing upon my bed, went to the particular hall and closed the doorway, I could barely hear everything. It sounded kind of like the particular whine of fluorescent lights. Next up I returned in, closed my power outage curtains and tested the flashlight. It was ok, it had been the press-to-use kind plus did a decent job lighting up my room, but the switch was hard to hold straight down and the light would glint occasionally.

The AirTag owner was just a flimsy plastic material sheet heat-sealed together with a tuck-in flap to secure the particular AirTag. I tugged onto it and it tore straight by 50 % off the keychain like it was butter. Tried the door-pull and it worked (not certain what I was expecting presently there. ) And finally the stick. In case you don' t know what I' m talking about, Used to do my best to Google this and I think it' s called a " kubotan? " Whatever it is, when I examined it by stabbing it in the dirt it was so smooth and slippery I actually ended up just jamming my hand against the ground. I finally tried the bottle opener-looking things on a beer (they work, but the plastic is definitely chipped now) and had an excellent long sit-' n-think as to what I' d just discovered.

It was very clear that Jill had used the cheapest things possible to make her keychains, and I didn' t feel safe having Talia travelling with that will to " protect" her, especially when the top two exports where the lady currently is are SA kits and perma-sleeping human beings. I' m really mad at Jill right now for potentially putting people in danger with faulty/ineffective products, whenever all they have on the damn thing that even midway works are the seatbelt cutter, flashlight, bottle opener, and the door-pull!

I want to tell Jill her product is crap, but I' m worried that I' m too upset and will say something I' ll regret. I think the girl business should continue, using higher-quality items that actually work. All I want to do at the moment is shout at her, but I don' to want her to give up about this, and she' s already been extra sensitive since the mugging so I know she' t not going to take this well.

EDIT: Y' all' re so hung up on me testing the keychain. We check each other' s stuff before we hand this over. She tested my birthday power drill before I even set eye on it. We call it " quality assurance" and we possess blanket permission to use each other' s stuff. A person guys are so gatekeepy together with your things. My question is about my SISTER and the girl cheap keychains.