Technology

Tattoos May Stop Apple Watch from Working

In this Sept. 9, 2014 file photo, the new Apple Watch is modeled during a media event in Cupertino, Calif. Apple CEO Tim Cook has hinted the wearable gadget will be as game-changing as Apple’s revolutionary iPhones and iPads, which have become indispensable accessories for millions around the globe. (AP Photo/Marcio Jose Sanchez, File)
In this Sept. 9, 2014 file photo, the new Apple Watch is modeled during a media event in Cupertino, Calif. (AP Photo/Marcio Jose Sanchez, File)

 

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

Since the Apple 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.

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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