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Amazon.com: HAYLOU Smart Watches for Men Women, Fitness Tracker with Heart Rate Blood Oxygen Sleep Monitor, 12-Day Battery Life, IP68 Waterproof Fitness Watch HD Touch Screen Smart Watch for Android iOS Phones :
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Haylou RS4: Xiaomi ecosystem smartwatch with 1.78" AMOLED screen, SpO2 sensor, IP68 protection and autonomy up to 10 days for $44 | Gagadget.com
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