Here's some information about the H37 Ultra3 Smart Watch:

Features: It typically includes Bluetooth calling, heart rate monitoring, sleep tracking, and multiple sports modes. 

Display: Many versions feature an HD or AMOLED display, often around 2.01 or 2.06 inches. 

Accessories: Some models come with multiple interchangeable straps for customization. 

Connectivity: It supports Bluetooth calling and is often compatible with both Android and iOS devices. 

Health Tracking: It can monitor various health metrics, including heart rate, sleep, and blood oxygen levels.