This Alarm& Monitoring Indicator is a tower crane safety system. It has the following functions: Working temperature: -20 --- + 60 -40 --- + 80 Working humidity: ≤ 95%/25 Combined error: 1% Power supply: AC220V (to be customized according to clients requirement) Parameter: Rated load, actual load, trolley amplitude, hook height and moment percentage Signal lamp&buzzer: Flickering yellow lamp and buzzers discontinuous response indicates early warning, whereas red lamp and buzzers continuous response indicates alarm and relay outputs. Other functions: Records downloading; sensors self-diagnostic; applicable to tower crane with standard fall Remarks: CXT/20P-I is a basic model while CXT/20P-IR add the function of slewing indication and CXT/20P-IF adds the function of anemometer.