The Ultramax Carbon Monoxide Detector Warning Alarm Sensor is a battery-powered unit with an 85dB alarm that provides important protection for your home. This white-coloured detector is compact with a diameter of 9 cm and depth of 3 cm, making it easy to install in any room. It features an electrochemical carbon monoxide sensor and voice alerts to ensure you are aware of any potential dangers. Manufactured in the United Kingdom, this detector comes with a 1-month manufacturer warranty and requires 3 batteries for operation. Keep your home safe with this reliable and efficient CO detector.