印度采购需求：最佳健康追踪智能手表、卡片式手表、中国制造手表、其他智能手表、屏幕手表价格、带SIM卡槽的智能手表

I'm looking for a black smart watch that combines style with functionality. It should feature essential health tracking capabilities such as heart rate monitoring and sleep analysis. Additionally, Bluetooth connectivity and compatibility with both Android and iOS devices are important for seamless integration with smartphones. Please provide details on the available models, including specifications, pricing, and any customization options. It's also great if you could share the estimated lead time for orders. I'm eager to explore how we can collaborate on this product!