1、Using microprocessor intelligent control, built-in voice chip, operation live voice prompts. 2、Backlit digital display alarm concentration. 3、With back-up battery function, 1.5V * 3 battery can be used for power supply. 4、High reliability sensor design, efficient and stable inductive transmission. 5、Low current consumption, long standby life, low battery indication. Description: This product is a smart voice CO and smoke detector, using advanced electrochemical CO sensor and infrared light sensor, with high stability and small sensitivity drift. Features: Using microprocessor intelligent control, built-in voice chip, operation live voice prompts. Backlit digital display alarm concentration. With back-up battery function, 1.5V * 3 battery can be used for power supply. High reliability sensor design, efficient and stable inductive transmission. Low current consumption, long standby life, low battery indication. Sensor failure self-test function. Alarm memory function, you can view the alarm record at any time. Live sound and light alarm LED indicates alarm when gas leaks. SMT industrial manufacturing, strong stability. Specifications: Power supply : 3 * 1.5V AA battery(Not included) Static current : < 80UA Alarm current : < 30MA Alarm voice : Smart human voice prompt Sensor: Electrochemical carbon monoxide sensor and Infrared photoelectric sensor Temperature : 0c-50 % C Relative Humidity : 10-95% Carbon monoxide sensor detect concentration : 000-999 PPM Smoke sensor sensitive : 0 . 1 % db / m-9 . 9 % db / m Alarm indication : LCD display , voice prompt Battery capacity : Low battery alarm Dimensions : Approx. 10 * 10 * 4cm / 3.9 * 3.9 * 1.5in Packing List: 1 * Alarm 1 * User Manual