【1.43" AMOLED Display & Ultra-High Resolution Smartwatch】The digital watch equipped with a next-generation AMOLED screen featuring an ultra-clear 466×466 resolution and 5 adjustable brightness levels. Whether you're outdoors under bright sunlight or indoors at night, the display remains sharp, vivid, and easy to read, offering a smooth and responsive experience. 【Long-Lasting 350 mAh Battery Life】Trully outdoor men watches fully charges in just 2.5 hours and supports up to 7 days of typical use, with an extended standby time of up to 30 days. The Always-On Display (AOD) and palm-cover screen-off features provide added convenience while effectively reducing power consumption. 【Powered by Cywee Professional Algorithms for More Accurate Health Tracking】With the one-tap measurement feature, you can check your heart rate, blood oxygen, and stress level at the same time. The fitness watch also supports nap monitoring, 100+ sports modes, and customizable workout types. Detailed health and fitness data can be viewed through the app to help you better understand your body. 【Practical Outdoor Tools & IP68 Waterproof Rating】Built with a compass, flashlight, and dual physical buttons for easier outdoor operation. The durable alloy case and reinforced screen resist scratches and impacts, while the watch’s waterproof, dustproof, and shock-resistant design ensures reliability in harsh outdoor environments. 【Bluetooth Calling & Smart Notifications】Featuring the latest Bluetooth 5.2 chip, the smartwatch includes a high-quality speaker and microphone, allowing you to make and receive calls directly from your wrist. It also supports message alerts, alarms, weather updates, music control, and other daily essentials (message reply not supported). 【Reliable After-Sales Support】Aolon provides a 12-month warranty and responsive customer service within 24 hours. If you have any questions or encounter any issues, please contact us through Amazon Customer Support. AOLON Tetra R4 1.43" HD AMOLED Sports Smart Watch for Men, Activity Tracker with 100+ Sports Modes, IP68 Waterproof Grade, Heart Rate, Blood Oxygen Monitor Smartwatch for Android iOS, Heart rate monitoring, Sleep monitoring, Blood Oxygen Monitoring, 100+ Sports modes, Activities Tracker, BT Call, Text/Messages reminder, Music Control, Camera control, Weather forecast, Find your phone, Calculator, Alarm clock, Stopwatch, Flashlight, Sedentary reminder, Breathing excerises, Women's Mentrual Tracking, AI Voice, DIY Watch Face, Compass, Altimeter, Barometric altitude meter, AGPS, World Clock, Emergency Call, Always-On Display, Saiwei Algorithm