Features: Aluminium alloy and zinc alloy material is sturdy, lightweight, durable and long lasting. Combination can be reset easily and frequently. No key is needed, which will be no pollutant for waste. Suitable to be used in different environments even harsh environment. Easy to use and short unlocking time (10s averagely). 3-digit combination is firm and secure without fear of having locks cut open. Small size is convenient to carry, which is great for travel or other outings. Specifications: Material: Aluminium Alloy + Zinc Alloy Optional Colors: Blue, Orange, Silver Size: 110 * 62 * 12mm / 4.3 * 2.4 * 0.5inch Suitable For: Backpack, Travel Bag, Sport Bag, Door, Window, Locker, etc. Package Weight: 65g Type: Lock Steps to Modify Password: 1. Align the "0" on the 3 rollers with the middle line. 2. After the lock is opened, use the tip of the pen to press the password setting button, keep it still before setting the instruction, and set the new password by turning the number wheel to align the number with the instruction. 3. Release the button to return it to the normal position, that is, successfully set a new password. 4. Rotate the numbers randomly, and it will become a password locked state. Package Includes: 1 x Luggage Carabiner Only . Note: 1. After the password is modified, you can record the password with a mobile phone, etc., to avoid the series of troubles caused by the lock being scrapped due to the forgotten password. 2. Customers who don't know how to set a password can contact customer service to help you adjust the password you want when we send it out.