1.Description : Carbon Monoxide and Smoke Alarm Sensor Compound Type Smoke & CO Detector PPM LCD Display Indicator Battery Powered Wireless Installation 2.Features : High accurate electrochemical sensor and infrared photoelectric sensor. 3*AA battery powered(Not included, with low-battery warning. One-click to stop the alarming sound manually. Sound & flashing alarm & LED indicating alarm. SMT manufacture technology, reliable stability. 3.Parameters: Item name: Smoke & CO Detector Color: White Battery: 3*AA battery powered (not included Working temperature: 0~55℃ Size: 105*105*40 mm Weight: about 180 g 4.Note: This product is a carbon monoxide smoke composite detector and cannot be used to detect combustible gases (gas, natural gas, liquefied petroleum gas, etc. Compound type smoke and Carbon monoxide detector alarm can reduce the occurrence of disasters, but it cannot be guaranteed to be foolproof. For your safety, please use this product correctly, at the same time, we should be