The glossy brochures promise two shots firing at 180 km/h effective in any weather conditions but if you don't aim and hit right it may be close to useless. Watch this video until after the second shot at about 8 minutes to see the difference. It is advice really worth watching including how to hold and carry a purse/handbag.
This device sells for about R700 (US$47) in South Africa and is fairly popular due to its compact size and claimed long shelf-life. Sprays can be cheaper but expire sooner and spraying into a headwind is going to knock you out (the Guardian Angel fires a gel).
Watch at https://youtu.be/0yiByPsy2W8
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