Description USB interface, universally compatible with laptops, PCs, or computers (not suitable for USB 3.0). 4-digit password combination, easy to set. Easy to install and use for high computer security, theft prevention. Works with all laptops, desktops, docking stations with a built-in standard security lock slot. Instructions: Align the password with the lock housing, and turn the code switch to the direction with your hand, and hold it down until the step is complete (do not release during the setting process). Set the first password, e.g., 1-0-0-0, release the code switch, check if the password is set correctly, then repeat the steps above and then set the second, third, and fourth passwords. Once you have correctly set the password, you must immediately enter the password to prevent it from being incorrect due to accidental misuse of the code switch. Verify the password is set and then lock it to your computer. Specifications: Type: USB Laptop Lock Used for: Most digital devices with a USB hole Features: Universal, 4-digit password, easy to use, laptop security cable Length: 1.9 m Cable Diameter: 5 mm Material: Alloy Color: Black Gray + Silver Package Contents: 2 x lock cable Note: Light reflection and different displays may cause the color of the item in the picture to look slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.