No installation is required, you simply place the battery-powered doorstop at the base of any door, turn it on and go about your business
Features:
1. Place the alarm on the floor behind the door, when somebody pushes the door, the alarm will emit a 120dB sound with the red flashlight, and the door cannot be opened.
2. Press the button to "L", and start the alarm. Press the button to "H", and turn on the sensor function.
3. It is a good helper when you travel, on business, and live alone, providing effective security and protection for hotels, apartments, dormitories, bathrooms, and bedrooms.