Tattoos may stop Apple Watch from working

Tattoos may stop Apple Watch from working

Your mother hates your tattoos. So does your Apple Watch, apparently.

Tattooed wrists can prevent the Apple Watch’s heart rate sensor from functioning properly, according to some customers.

Since the Apple (AAPL, Tech30) Watch uses your heart rate to determine whether you’re wearing it, you might not be able to use Apple Pay, receive notifications, place calls, or use certain apps if you have tattoos on your wrists.

Some Apple Watch wearers on Reddit and Twitter complained about the tattoo issue, and Apple blog iMore confirmed that the problem exists.

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The issue stems from the way that the Apple Watch senses your heartbeat. According to Apple, the back of the Watch rapidly flashes green and infrared light at your skin, which gets absorbed or reflected by your red blood. When your heart beats, there is more blood in your wrist, and there is less blood between beats. By sensing the timing between your heartbeats, the Apple Watch can calculate your heart rate.

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