Area Alarms are used to monitor the radiation level in a certain area. Set at a threshold of 7.5 uSv/hr. The device will show when radiation levels exceed this.Our GammaBeacon's can be tuned to whatever dose rate you want for the safe radiation level, exposure imminent and radiation high. 60 hours battery life (gamma alarm state theirs is 35) with a 4 hour charge time and robust design. High intensity LED's can produce a bright light in any colour you want although they are set to standard green, amber and red.