Model – SA80946. Door and Window Alarm. Powerful 120dB siren sounds when window or door is opened. Can also be switched to chime or off mode. Easy to set up and install. Self adhesive pad supplied. No tools required. Sensor mounts on either side of alarm for easier set up and use. Ideal for vulnerable entries. Low battery test button. Requires four LR44 batteries per alarm (included). Two pack. Each unit measures 2.38 inch x 1.5 inch. White composition casing. Hang packaged.