Feature:<br> Working principle of induction door magnetic: When someone illegally opens a door or window (the host is separated from the magnetic strip), the door magnetic alarm immediately emits a sharp alarm sound<br> Closed state: No alarm will sound when the distance between the host and the magnetic strip is within 1cm<br> Open state: When the distance between the host and the magnetic strip is more than 1cm, a loud alarm sound will be emitted<br> Five modes<br> Door opening alarm, door closing stops<br> Ding-Ding doorbell mode<br> Door opening alarm for 30 seconds<br> DI DI DI Mode<br> After 15 seconds of opening the door, the alarm will sound for 30 seconds before it ends<br> (Short press to switch modes; Can adjust volume)<br> Specification:<br> Size: 6.5*3.4*1.65cm<br> Package Included:1 x Alarm<br> Note:<br> 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!<br> 2. Please allow 1-3cm measuring deviation due to manual measurement. ( 1 inch = 2.54 cm )