The NBS013 lock, designed for ultra-slim laptops with 2.5x6 mm nano slot, prevents laptop from being stolen or falling on the floor to protect your laptops safely. Ideal for coffee shops, hotels, offices, schools, etc. And that's how easy it works: Insert the key into the lock hole behind the lock. Wrap the cable around a firm object. Insert the key lock into the notebook and turn the key anticlockwise. Wrap the cable around a solid object. Insert the key lock into the notebook and turn the key counterclockwise. Pull the key out of the keyhole.