|This product ia a ring-shaped panic button. The internal circuit uses acoustic resonator to stabilize the frequency. It features in stable frequency, strong penetrating signal and low power consumption. When people are faced with an emergency situation, as long as the panic button is laterally pressed, it can be widely used in homes, factories. schools, banks, shops, convenience stores, financial room, villas, residential and other areas which are in need of protection. It can protect your life and property from infringement.