Features: 1.Using microprocessor intelligent control, built-in voice chip, operation live voice prompts. 2.Backlight digital display alarm concentration, alarm work can be between AC90-240V. 3.With backup battery function, 9V Ni-MH rechargeable battery can be used. 4.High reliability dual sensor design, efficient and stable inductive transmission. 5.Sensor failure self-test function. Specification: Description: This product is a smart voice CO and flammable gas composite detector, using catalytic combustion sensors and advanced electrochemical CO sensors, with high stability and small sensitivity drift. Features: Using microprocessor intelligent control, built-in voice chip, operation live voice prompts. Backlight digital display alarm concentration, alarm work can be between AC90-240V. With backup battery function, 9V Ni-MH rechargeable battery can be used. High reliability dual sensor design, efficient and stable inductive transmission. Sensor failure self-test function. Alarm memory function, you can view the alarm record at any time. The alarm sounds on the spot when the alarm is sounded. Specifications: Plug: US, EU, UK, AU.(Optional) External power supply: AC 90V-240V50-60Hz Built-in battery: 9V Ni-MH rechargeable battery Working temperature: 0-50C Operating Humidity: Relative humidity 10%-95% Display concentration: - Carbon monoxide: 100PPM999PPM (+50PPM) - Combustible gas: 0.25% 2% LEL (2500PPM-20000PPM1500ppm) Indicator information: - AC power: Green LED light - Alarm: Red LED flashes - Sensor failure: Yellow LED lights up Alarm sound: Live voice prompts and ringing siren Size: Approx. 11.3 * 7.5 * 4.5cm / 4.4 * 2.9 * 1.7in Weight: 60g Packing List: 1 * Alarm 1 * User Manual