Quantity: one piece (excluding batteries) Size: 10.4*10.4*3.9cm 1. Product introduction This product is an intelligent carbon monoxide compound smoke detector, which adopts micro-processing control and electrochemical sensor, and has the characteristics of high stability, low power consumption and energy saving. Low sensitivity drift. Mainly used in places where carbon monoxide leakage and fire may occur to ensure personal safety. 2. Features * Using high-reliability electrochemical sensors and infrared photoelectric sensors * LCD display density * 3*1.5V AA battery powered, battery not included * Low power consumption, long standby time * Low battery reminder * Alarm memory function * Alarm reminder (silent mode) * Sound and light alarm/LED indicator light alarm Notes: This product is a carbon monoxide composite smoke detector and cannot be used to detect combustible gases (coal gas, natural gas, liquefied petroleum gas, etc.) This product requires regular maintenance. Clean the dust