The carbon monoxide detector effectively monitoring of Carbon Monoxide, Temperature and Humidity, so that you timely understand the surrounding environmental problems and sends out 85DB alarms. Avoid dangerous accidents and protect personal and property safety. 3 In 1 Carbon Monoxide Detectors - Equipped with 3 major air indicators of Carbon Monoxide(0 to 1000PPM), Temperature(1 to 176 ?), and Humidity(0% to 95%RH) to protect your family. Accuracy Durability - This Carbon Monoxide Detector use Imported Electrochemical Sensor, high reliability, more responsive, when the CO gas concentration reaches the alarm level( 150ppm), the Voice and SLight alarm will work. Easy to Use - Plug and play, saving installation time. Compact Design - Portable CO Gas Detector is small and light, can be carry to anywhere easily, Big color LCD display, The high-definition screen makes it easy to read even at night. Protect Your Home - Carbon monoxide alarm are suitable for bedroom, kitchen, living room, bathroom, apartment, garage, office, restaurant, hotel, RV etc. Worry-Free After Service - We are willing to provide you with unconditional returns and exchanges within 180 days. If you have any questions, please contact us by email, we will try our best to help you solve the problem.