new CO Detector BS EN50291 Approved,meets UL2034 5 years warranty Self-testing anytime ,hush Alarm memory & recor Carbon Monoxide Detector CO alarm ... Best Benefit High Technology Specifications 1,Self-testing anytime;2, Alarm memory & query record function;3, LCD display concentration (3 ... .Test/Hush/Reset Button with 3 LEDS 7. Low Battery alarm (alarm,LCD display $ LED indication)8, Can not be fitted ...