Instruct: Classify the given Amazon review into its appropriate rating category
Query: Magnet too weak

I like the concept, but the magnet isn't strong enough to keep the band tight against the wrist. This causes the band to loosen slowly, until it either falls off or spins around on your wrist, making it unable to capture biometric information and requiring you to re-enter the unlock lock PIN. Maybe other brands would work better, but this one didn't work for me.