MC-05 130dB Remote Door Magnetic Alarm With Light Reminder 1. Seven major functions: -Volume adjustment -Light reminder: The LED light flashes once when the remote control button is pressed, and the LED light keeps flashing when the alarm is issued -Anti-theft mode 1: Open the door immediately with sound and light alarm for 30 seconds, even if the door is closed in advance, the alarm will sound for 30 seconds -Anti-theft mode 2: sound and light alarm immediately when the door is opened, and stop the alarm when the door is closed -Didi mode: Anti-theft of valuables, open the door and make a beep alarm sound -Welcome mode: Dingdong door bell, the door sensor emits "dingdong, dingdong sound" when the door is opened -SOS mode: Manual alarm in case of danger, press the emergency button (SOS) to give an audible and visual alarm for 30 seconds 2. Volume: 130 decibels 3. Material: ABS 4. Remote control distance: greater than or equal to 25 meters (open area) 5. Standby time: about 1 year 6. Power supply mode: door sensor uses 2 x AAA batteries (not included) 7. Host size: 92 x 42 x 17 mm