... meets EN50291 or UL2034;12.Alarm Sound Level: >85dB at 10 feet (3m);13.Easy to install, move and maintain;14.5 ... 60 ~ 90 mins At 100 ppm, unit must alarm within 10 ~ 40 mins At 300 ppm, unit must alarm within 3 ... 60 ~ 240 mins At 150 ppm, unit must alarm within 10 ~ 50 mins At 400 ppm, unit must alarm within 4 ...