Xiaomi Haylou Solar: Not solar-powered, but a smartwatch that costs just ~US$20 - NotebookCheck.net News
Haylou RS4 Plus Silver Smart Watch,1.78” Retina AMOLED Display,368*448 Pixel,Craft With Metal 105 Sports Mode,100+ Online Watch Faces & Customized Watch Face SpO2 Heart Rates,Sleep And Temperature - Walmart.com