New Upgrades - This Carbon Monoxide detectors Equipped with 3 major air indicators of Carbon Monoxide(0 to 999PPM), Temperature(1 to 176 °F), and Humidity(0% to 95%RH) to protect your family. Easy to Use - Plug and play, saving installation time. Accuracy & Durability - This Carbon Monoxide Alarm use Imported Electrochemical Sensor, high reliability, more responsive, when the CO gas concentration reaches the alarm level( 150ppm), the Voice and Light alarm will work. Compact Design & Clear LCD Display - Portable CO Gas Detector Meter 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. Widely Used - CO Detector are suitable for bedroom, kitchen, living room, bathroom, apartment, garage, office, restaurant, hotel, RV etc. KH Alert AC Plug-In Carbon Monoxide Detector with Temperature Humidity Sensor Built-in br KH Alert is a company specializing in the production of gas detectors. br Our factory has ISO:2015 management system certification, every step of the product will be layer upon layer, strict selection of materials, quality control, through the strict testing, so that each product has the best quality. This Sensor uses Imported Electrochemical Technology, which is extremely sensitive to carbon monoxide sensing and prevents false alarms from occurring.