Just look for any 20mm strap/band and it should fit. I’d recommend a band with quick-release pins.
From the manufacturer
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AMOLED Display & Editable WidgetsThe customized 1.65-inch stylish square screen offers a larger display area than a round watch face of the same width. The key information is displayed centrally, focusing on what matters most to you. | 14 Days Battery LifeAmazfit GTS brings about a long-lasting endurance of 14 days while keeping a slim watch body, which enables you to avoid frequent charges. | 5 ATM Water ResistanceWater resistant to a depth of 50 meters, Amazfit GTS also supports multiple swimming scenarios. |
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12 Sports ModesAmazfit GTS supports 12 mainstream exercise modes. These are outdoor running, walking, outdoor cycling, indoor cycling, treadmill, elliptical trainer, climb, trail run, pool swimming, open water swimming, skiing, exercise. | Slim Metal Watch BodyA smooth transition from the 2.5D curved glass to the metal watch body lowers the thickness to 9.4 mm, which makes it slim and delicate. | PPG Sensor & Realbeats AI-Based EngineAmazfit GTS can perform constant 24-hour high-precision heart-rate monitoring as well as a heart-rate interval monitoring during workouts, and warning if a much too high value is detected. |
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Amazfit GTS Fitness Smartwatch with Heart Rate Monitor, 14-Day Battery Life, Music Control, 1.65" Display, Sleep and Swim Tracking, GPS, Water Resistant, Smart Notifications, Desert Gold,Amazfit,W1914OV7N