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If Natalie Portman's character in V for Vendetta had this safety alarm pedometer, she would have never met V and the movie would have been 10 minutes long. The Sportline 334 is a regular pedometer — tracking your steps and counting your calories burned — but it also makes a 100db noise to alert bystanders. It retails for £16.95, which is a cheap price to pay for peace of mind.

Safety alarm pedometer [Shiny Shiny]