Using this bike lock is easy. First, wrap the 1.5 - meter long chain around your bike's frame and a fixed object like a bike rack. Then insert one of the three keys into the lock and turn it to secure. The 90dB alarm will go off if someone tries to tamper with the lock. Remember to record the unique identification number on the keys or the metal tag as soon as you get the lock. This is important for the replacement key service. When it comes to maintenance, keep the chain clean and dry. If the alarm stops working, check the two CR2032 batteries and replace them if needed. Always store the lock in a dry place to prevent rust and damage.