Door and window contact sensor: When the door is opened, the magnetic door and window alarm will emit a 130dB volume bell. It can prevent your child from sneaking. It is a perfect anti-theft wireless security magnetic alarm, suitable for children, families, garages, mailboxes and corporate security. 4 types of alarm methods: There are 4 types of alarm methods: 1 normal alarm method (open door alarm for 1 minute); 2 wireless doorbell mode (dingdong, once as a welcome tone); 3 alarm and stop mode (if the door The sound is loud when you open it, and it will stop once your door is closed); 4 Door-closing reminder mode (Didi), from bottom to top, repeat the sound reminder until the door is closed) Easy to install: This home/window security alarm kit is equipped with a self-adhesive pad, so no tools are required, just stick the sensor and alarm to the door or window. Can also be used as door stop alarm, swimming pool door alarm, garage door alarm or sliding door alarm Automatic quick switch: With the help of ultra-sensitive magnetic sensors, this alarm kit can quickly detect whether your doors and windows are open. Powered by 2 AAA batteries (not included) This door and window alarm provides a simple solution to protect your house from intrusion with a 120 dB alarm. It is also very suitable to prevent your children from opening doors they should not open and to ensure your childrens safety. Doorbell Principle of System Operation No magnetic wire sensor triggers an alarm The alarm will sound when the distance between the alarm and the magnetic strip is greater than 10mm. You can set the door and window detector to any of the 4 modes you want, and change it at any time. Alarm Casa Senza Fili The alarm will last for 1 minute Mode 1 is a normal alarm, which is issued when there is a violation. Ding Dong once rang as a welcome word Mode 2 is the bell that sounds when the door is opened (a pleasant jingle like in a store). When it turns on the siren, it stops when it turns off Pay attention to the safety door at the top of the stairs or in your childs room; if your medicine cabinet, freezer door or kitchen drawer opens accidentally, you will receive an instant alert. Repeat 3 beeps every 3 seconds until it turns off Mode 4 is a very practical door-closing reminder ringtone. All you have to do is to install the battery, glue the system, choose your mode, and you can start. Uses 2 AAA batteries Note: When the alarm is low, you need to replace the battery to better protect your home. Double-sided tape can be easily installed on windows or doors. No wiring required No screws needed Stick the double-sided tape on the back of the alarm and magnetic stripe. Wipe the corresponding position of the door/window, paste the fixed alarm, and then press firmly. Follow step 2 to paste and fix the magnetic stripe. The gap should be less than 10mm. Test the alarm. Activate the alarm, open and close the door or window to check whether the alarm is working properly. Size: 30mmx 15mm x 100mm