English: Features: 1. High-quality alloy lock box, the overall lock box is made of high-quality alloy, which is waterproof. 2. After special cold rail treatment, hard casting. 3. The surface is chrome-plated, with exquisite craftsmanship and durability. 4. More effective against violent damage. 5. Suitable for indoor and outdoor doors. Specification: Product model: 38D Panel material: zinc alloy Password length: 2-4 digits Applicable door thickness: 10-60mm Applicable type: interior, exterior door Features: waterproof, no battery Lock tab center distance: standard 60mm Lock size: Approx. 107 x 43 x 20mm / 4.2 x 1.7 x 0.8in Package List: 1 x Mechanical Lock Set 1 x English Manual 2 x Installation Package Note: The passwords are not in order, the numbers cannot be repeated, please refer to the manual. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. English: Change Password: 1. Remove the 4 red screws from the back panel of the outer door keypad. 2. Open the back panel and be careful not to tamper with the numerous small parts inside. 3. Observe 3 red numbers, 6 ordinary blue numbers, and 1 C. 4. Press button C to move the inner locking piece, but do not move piece C. 6. Pay attention to the different characteristics of the red and blue locking tabs and insert them into the slots. 7. After positioning, cover the back panel after fixing it. After tightening, check it several times.