1. Chip: Apple Watch Series 8 is equipped with S8 SiP chip, and Apple Watch Series 7 S7 SiP chip, S8 SiP chip compared to S7 SiP chip has a small improvement.
2. Battery life: Apple Watch Series 8 can last up to 18 hours, and has a \"low battery mode\
3. Dustproof: Apple Watch Series 8 has IP6X dustproof function, while Watch Series 7 does not mark the dustproof level.
4. Color matching material: Apple Watch Series 8 has midnight color, starlight color, silver and red in the color matching of aluminum metal, while Watch Series 8 has less silver in the color matching of aluminum metal, but more green and blue. In the stainless steel material, the color matching of the two are the same, but the Watch Series 7 has a titanium metal material, which is the difference between the two in the color matching material.