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The key points for purchasing anti-fall chains for children's rooms are as follows:

- Safety: Choose styles with no sharp edges and no small parts (to avoid children swallowing by mistake). The chain connections should be smooth to prevent scratching children; priority is given to products with one-piece molding technology to reduce the risk of welding points falling off.

- Restriction range: Choose anti-fall chains with a length of 20-25 cm to control the opening angle of doors and windows within 10-15 degrees, which can ensure ventilation and prevent children from getting out through the gap.

- Material durability: Choose stainless steel (304 stainless steel is the best), which is corrosion-resistant and not easy to break. Avoid using zinc alloy and other materials that are easy to deform.

- Installation firmness: Use anti-loose screws (such as self-tapping screws with gaskets) to prevent screws from loosening due to children shaking doors and windows; the installation position should be as high as possible beyond the reach of children (such as more than 1.5 meters from the ground).

- Operational convenience: Adults can easily open and close, but children cannot disassemble or destroy it by themselves. Avoid choosing buckle-type styles that are easy for children to open.