Heavy-duty padlock for indoor and outdoor use. Features an integrated lock body, 304 stainless steel shackle, 54.3 mm wide lock body, and scratch-resistant 8 mm shackle, effectively preventing cutting and prying. Successfully passed over 180 hours of salt spray testing, proving its resilience in harsh conditions. One-button unlocking. Set your own 4-digit code (default is 0-0-0-0). After setting a new code, press the center button to open. Take a picture of your new code to avoid forgetting it. Concealed code. The code is located on the bottom of the lock for enhanced security. The code cannot be changed while the lock is closed, preventing unauthorized alterations. Anti-error design. To change the code, you must unscrew the screw, press the setting button to reveal the SET button, and then reset the code. This prevents accidental code changes. Multiple uses. High-quality stainless steel makes this padlock secure, theft-proof, waterproof, snow-proof, and rust-proof. Ideal for gardens, fences, warehouses, doors, garages, cabinets, and other indoor/outdoor locations. Unique appearance. The slightly curved casing and round button are simple and elegant; the lock surface has a non-slip texture for a comfortable feel. Small size and easy to carry.