... minutes 300ppm, alarm in 3 minutes* Standby current:≤10uA "(LCD)," 5uA (LCD).* Alarm current:≤25mA* Displaying Range: 0-999PPM* The ... 30 seconds Alarm: Red Led quickly flashes 4 times with unit chirping every 5 seconds, then repeat, * Low ... as battery lower than 3.3V with green LED flashing and Lb on LCD Why to Choose Lydian? * Professional ... CE&EN50291 7 years sensor Co Detector with LCD Display