On the back, the Apple Watch features an optical heart sensor to quickly check your heart rate, and an electric heart sensor that works with the crown
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Apple Watch S4 Series 4 40mm 44mm Smart Watch Cellular Aluminum Women & Men
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Apple Watch SE 2nd Gen GPS 40mm Midnight Aluminum Case Sport Band MNT73LL/A
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Glitter Beaded Bracelet Compatible for Apple Watch Women 38mm 40mm 41mm 42mm 44mm 45mm 49mm Band,Fohuas Crystal Pearl Bangle for iWatch
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Best Buy: Modal™ Silicone Watch Band for Apple Watch 42, 44, 45mm
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Silicone Solo Loop Strap for Apple Watch 7 Band 45mm 41mm 44mm
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Clear Acrylic Ice Cubes Resin Strap For Apple Watch 41mm 45 38 42
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Apple+Watch+Series+5+GPS+Cellular+44mm+Gold+Stainless+Steel+Case+
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Luxury Leather Strap For Apple Watch Band Series 7 6 5 4 Leopard
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Apple Watch SE (GPS) 44mm Aluminum Case with Sport Band Gold/Starlight
Shop Off-White IWatch Industrial 2.0 Belt Band
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The Apple Watch Ultra 2 Hodinkee Review