Alarm / doorbell function is free to chooseMagnetic sensor, motion detector for doors and windowsAnti-theft alarm function / reminder function doorIt is easy and convenient to install and can be easily mounted on windows or doorsWireless remote control to turn on or off; anti-theft alarm function volume 130dBLoud alarmLoud 130dB alarm can effectively prevent intruders from entering your door, your window and alert your neighbors of a possible break-in4 alarm modesSeveral alarm modes alarm allow wider use: anti-theft alarm; 30 seconds alarm; Doorbell sound; Di-Di remind alarm (sounds intermittently)Low battery reminderWhen the battery is low, the door alarm sounds an alert. Remind you to replace the battery in timeEasy to installThis burglar alarm is easy to install by adhesive, stick Put it on a window or door and you're done!Widely usedPerfect for home, l business, office, apartment, dorms, garage, and anything else you want to protectSpecificationsVolume range: 130 dBInstallation gap: