... *Electrochemistical CO Sensor *3 digits LCD displayer *Low bat and malfunction Indicator *CE, TUV EN50291 LCD display Carbon Monoxide Detector RCC426B,TUV EN50291 certificate Specification:* Power ... : Wall/Ceiling mounting* Dimension 100mm*40mm, Weight: 0.2kg* Comply With: CE, TUV EN50291 Battery Operated LCD display Carbon Monoxide Detector(RCC426B ), TUV EN50291