The bracelet lock is just a round rod driven into flexible plastic. A little pressure when moving while wearing and it pops back out - and falls off. Order this and you could lose your precious keychain. Has fallen off my wrist 10 times in a week so it's going back. A reasonable design would be similar to what you see on my Garmin exercise tracker - a rotating wheel lock that vertically locks the "I" shaped vertical pin after pressing and rotating, preventing the bracelet from falling off. Until they repeat it, find an alternative. Mr. or Mrs. Manufacturer, for further feedback, please feel free to contact me. If you change the design I'll be happy to try again and update this review.
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