The principle is the interference of metal and large iron gates. These devices will cause certain shielding and interference to supermarket anti-theft devices, thus causing random alarms in supermarket anti-theft devices.
Do not hang anti theft labels around the supermarket anti-theft device. The sticky notes here can easily cause interference and alarm to the supermarket anti-theft device, thereby reducing the sensitivity of the supermarket anti-theft device.
Pull the power supply for the supermarket anti-theft device alone. Since the supermarket anti-theft device is a precision device that requires high sensitivity, it is better not to mix it with other electrical equipment during use.