With two remote controls: The door alarm comes with two remote controls, you can use the remote controls to arm and disarm at home, which is very convenient to use. 130dB loud alarm: The door and window alarm has a built-in high-volume alarm speaker. When your door is opened, the door and window alarm will emit a 130dB alarm, which can scare away thieves and protect your home safety. Built-in battery: The door and window alarm has two built-in AAA batteries, which are durable and have a standby time of up to one year. It is powered by two AAA batteries. When the battery voltage of the door alarm is low, it is easy to replace. When it is higher than 2.4V, the door alarm will make a "beep" sound to remind you to replace the battery. With LED indicator: When someone opens the door, the door alarm will emit a 130dB alarm sound, and the LED indicator will flash for three seconds at the same time. Adjustable volume: The volume of the door alarm is adjustable. You can press the corresponding button to adjust the volume. When the volume is at its maximum, it will make a "beep" sound.