Features: ReliableUsing reliable electrochemical sensors and human voice, give you a better experience of operation, detection and installation. Digital displayLCE high-definition screen digital display, clearer and more intuitive, easy to see. The figure shows the concentration of carbon monoxide in the air, and when the concentration exceeds a certain level, an alarm sounds. Easy to useEasy installation, stable gusset, quick installation, with alarm memory function, check alarm records at any time. Long Life Subvert the traditional alarm, smaller, more accurate, lower power consumption, super battery life. LightweightVery light and thin,small size,metal mesh,modern style.it is palm sized,it can be taken with you when camping. Specifications: Type: Carbon Monoxide Alarm Material: Metal, ABSQuantity: 1pc color: white working temperature: 0-50Relative Humidity: 10%-95% detection concentration: 000-999Sensitivity: 3 ppmError: +/- 10% detection range: 10 (m) Concentration measurement on alarm: 030-9030-999PPMRead the concentration measurement during normal work: 000 PPM Battery: 3 * AAA batteries (not included) Package size: 11.5 * 11 * 4cm / 4.52 * 4.32 * 1.57in Net Weight: 160g / 5.64ozPackages: 1 * Carbon Monoxide Alarm Notes:1. Due to manual measurement, please allow 1-3 cm error. Make sure you don't mind before you bid.2.Colors may vary due to different monitors, please understand. Thank you for your support :)