CO Detector BS EN50291 Approved,meets UL2034 5 years warranty Self-testing anytime ,hush Alarm memory & recor Carbon Monoxide Detector CO alarm with EN50291 or UL2034 standardsGood Qualty High Safety Best Benefit High Technology Specifications 1,Self-testing anytime;2, Alarm memory & query record function;3, LCD display concentration (3 digitals);4.Three LEDS to indicate different status: power ...