When selecting a watch set, you must prioritize the movement type, as it dictates the product's longevity and accuracy. For mid-to-high-end sets, look for Japanese (Miyota or Seiko) or Swiss movements. The case material should ideally be 316L Stainless Steel for corrosion resistance, rather than alloy. Additionally, ensure the crystal is made of Sapphire Glass for scratch resistance or Hardlex for durability. For the accompanying accessories (bracelets, necklaces, or extra straps), verify that they are nickel-free and lead-free to prevent skin irritation.