• Simple-to-use window/door alarm• Ear-splitting 105 d B siren• Ultra-bright red LED beacon Easy to fit with the self-adhesive pads or screws that are supplied. Install the batteries, stick the Door Alarm to a door (or window) & the magnet to the frame & switch on. If the door is opened the alarm sounds its 105 d B siren & flashes the ultra-bright red LED. Requires two AAA batteries (not supplied), alkaline recommended.