Personal alarm function: pull out the top plug, the host will send out 125dB alarm sound, and the LED Door handle inductive alarm function: use the magnet behind the host to adsorb the product on the metal door handle (you can use the matching wire rope to hang the host on the door handle) and turn on the side switch of the host. When the human body is 0.5m away from the host, wait for 10 seconds before the product is ready for use.