4 in 1 Door Magnet Refrigerator Delayed Door Closing Bell Anti-theft Alarm (3V) Specifications 1. Alarm: 108 decibels 2. Delay time upgraded to: 3153060 seconds, default delay 15 seconds 3. Prompt sound upgraded: drip-drop prompt is slower, not noisy and harsh 4. After canceling the trigger, there will be a beep prompt, silent protection, and prompt after delay 5. The host has two No. 7 batteries, and the battery is not delivered 6. General alarm: When the door or window is opened, the alarm sound will be issued immediately 7. Door closing alarm: If the door has been opened for 15 seconds (15 seconds is the factory default value, 3 seconds15 seconds30 seconds60 seconds according to your choice), the alarm will continue to sound until the door is closed 8. Doorbell mode: a "ding-dong" sound is emitted when the door is opened 9. When the battery is low, the LED flashes once per second and a "BiBi" sound is emitted twice every 30 minutes to remind you to replace the battery 10. Easy to install and easy to set up, fix the magnetic bar within 1cm next to the magnetic sensor, use double-sided tape to keep the two alignment arrows opposite 11. Size: 85x43mm, magnetic bar 45x10mm Installation Battery Installation: 1. Open the battery door, and loaded two AAA alkaline batteries. 2. When the battery after you install the unit will sound one long, one short a??Bea?|Bea?? Prompt the battery to a successful installation: 1. Please use alkaline batteries in order to get good use of effects, such as the use of other batteries can cause the battery use shorter or alarm sound. Installation: 1. Select windows and doors installation location, with water and a rag clear clean the mounting surface, the double-sided adhesive tape on the bottom and then the unit attached to the clean position. 2. Installed host, and then double-sided paste the magnet solid set in the host next to the door or door frame, pay attention please the magnets arrow at the arrow to