At least read the one about how to turn off the alarm. I turned it on and it SHRIEEEEKED, which was GREAT but the landlady lives right across the hall from me and to keep her from running out her door having conniptions, I had to find a BIIIG pillow to put the BodyGard under until I could read the directions and turn off The Shriek. How loud is The Shriek? Well, if someone bothers you on the subway or in a bus or stairwell, the noise will echo from all four corners of the vehicle and if it does not stun the person it will at least draw ALOT of attention to you both. The button for The Shriek is flush with the BodyGard's body but I recommend hanging it from a zipper instead of putting it in a pocket, where a finger inadvertantly gripping it may cause a minor panic.The ring to hang this with is a decent size -- I would have wanted something larger but all I have to do is go into a hardware store and get one cheap.The knife to cut a seatbelt is a single(?)-edge razor in a setup similar to those free envelope openers they sometimes give out at the stationery store. It looks sharp enough - I hope it works. The user has to pull the red plastic cover away in order to expose the cutting edge, and that is simple enough to do especially since all you have to do is put a finger in the keyring and pull. In a real emergency situation I think that red cover will get lost in the process, and if so, I hope it can be replaced. Well, maybe it won;t get lost if your keys are hanging on it -- but ayway.. it's a thought.Flashlight beam is O..K.. a nice blue white light but not as intense as I think it should be. A second touch of the flashlight button produces a flashing red light which is GREAT.I would have like to have tested the glass cutter. It seems to be spring loaded and I hope it works. I could not find any glass (other than my balcony door or my apartment windows) on which to try it, and of course, with or without the landlady in such close proximity, THAT is a no-no.All in all, the Swiss+Tech ST81005 BodyGard ESC 5-in-1 Automobile Emergency Tool is a great, small tool that could easily save your life in many ways.