Door and Window Contact Sensor: This magnetic door and window alarm will ring with 130dB volume when the door is opened. It can prevent your kids from sneaking in. And it is a magnetic doorbell alarm from anti-theft wireless security perfect for childproof, home, garage, mailbox and business security 4 Alarm Modes: It has 4 alarm modes: 1 Ordinary alarm mode (alarm will sound 1 minute if the door is opened); 2 Wireless doorbell mode (Ding dong, sounds once as a welcome tone); 3 Alarm and Stop Mode (sounds loudly if the door is opened, and it will stop as soon as your door is closed); 4 Door close reminder (Di Di) mode, from bottom to top, it will remind you with repeated sound until the door is closed) Easy to install: This home/window alarm security kit comes with self-adhesive pads, so no tools are required, just stick the sensor and alarm to the door or window. window. It can also be used as door stop alarm, pool door alarm, garage door alarm or sliding door alarm Automatic and fast switch: With an ultra-sensitive magnetic sensor, this alarm kit can quickly detect if your door or window is open. Powered by 2 AAA batteries (not included) the alarm will last for 1 minute Mode 1 is a normal alarm that sounds on violation. Ding dong, sounds once as a welcome tone Mode 2 is a bell that rings when the door opens (a pleasant ding dong like in the shops). When it opens an alarm siren, stop when closing Watch the security gate at the top of the stairs or in your childs room; Get instant alerts if your medicine cabinet, freezer door or kitchen drawers are opened unexpectedly. Repeat 3 beeps every 3 seconds until it turns off mode 4 is a very practical door closing reminder.