What is 38mm apple watch?

The 38mm Apple Watch is one of the two models available, the other being the 42mm. It has a display size of 1.5 inches with a resolution of 272 x 340 pixels. It has a heart rate monitor, accelerometer, gyroscope, and ambient light sensor. It is powered by an S1 processor and runs on WatchOS. It is available in various materials including aluminum, stainless steel, and ceramic, and comes in a range of colors and customizable bands. It offers features such as messaging, phone calls, music control, activity tracking, and access to various apps. It also has a water-resistant rating of up to 50 meters.