1, different models: Xiaomi Watch S 1, S2 and S3 are three watches introduced by Xiaomi Company with different models, namely Xiaomi Watch S 1, Xiaomi Watch S2 and Xiaomi Watch S3.

2. Different functions: These three watches are also different in function. Xiaomi Watch S 1 mainly has basic motion monitoring functions, such as step counting and heart rate monitoring. On this basis, Xiaomi Watch S2 has added more intelligent functions, such as supporting voice assistants and answering phones. Xiaomi Watch S3 further enhances intelligent functions, such as supporting NFC payment and independent calls.

3. Different designs: In addition to functions, these three watches are also different in design. Xiaomi watch S 1 adopts a classic round dial design, which is relatively simple; Xiaomi watch S2 adopts a square screen design and a metal body, which is more fashionable; Xiaomi Watch S3 is designed with a round screen and a ceramic body, which is more high-end.