HIGH SECURITY 4 digits offers 10,000 combinations for increased security compared to 3 digits. Put your mind at rest while doing your sport or work. STURDY CONSTRUCTION With high strength zinc alloy body, hardened steel shackle and excellent craftsmanship, the heavy duty long shackle padlocks are weather resistant, rust proof and resistant to cutting and sawing. SPECIAL DESIGN Compact size, light weight and convenient to store and carry. Side windows for easy viewing of combinations. EASY TO SETUP Digital combination design makes it easy to set and reset your own favorite combination and carry the key hassle-free. WIDE USE Suitable for storage units, gym, school, work lockers, swimming pool, etc. The original number is 0-0-0-0. To set your own combination, please follow these simple steps: 1.Lift the shackle to open the lock. 2.Turn the shackle 90 counterclockwise and press down fully. 3.Set your own combination by turning the dials. 4.Return the shackle as normal. Then the setting is completed.