When the lock cylinder is pressed, the lock will be locked and a beep will be heard. After 15 seconds, the lock will enter the alert state. When the lock body is shaken, it will be shaken again after 5 seconds, and then the alarm will be given continuously. After that, the alarm will return to the original alert state if there is no vibration within 35 seconds after the alarm is finished. If the disc lock is unlocked with the key, the alert state will be stopped. When the battery is about to run out of power, the alarm will suddenly stop to remind the owner that the battery needs to be replaced. When replacing the battery, first screw out the screw at the bottom of the disc lock, and then take out the upper cover upwards to replace it, but you must pay attention to the "positive and negative" poles of the battery.