... calibration ,zero tracking function.Specifications:Detection type: Leakage current, temperature, overvoltage, under-voltage, over-currentCapacity: 64/128/256/ ... 2A/DC24V or 1A/AC220VDisplay mode:LCD Working condition: Temperature: 0°C~ 55°C Humidity:<93%RH(40°C ... ,XE3112SWL,XE3112H,XE3122,XE3123, XE3124,XE3125, XE3126Our system diagarm addressable electrical fire alarm system for mostly 512 points