* High anti-false alarm: 4-band frequency optional, one band frequency for one beam * High stability: work normally in bad weather when up to 99 percents of beams are blocked * Anti-thunder stroke: advanced electronic interference proof circuit design * High RFI/EMI immunity ability * Interruption period adjustable to ensure high flexibility and adaptability * Protection grade IP65: sealed rubber ring design * White light immunity: 50,000 lux * Dew and frost proof solution: heater housing. * Up to 250 m outdoor range, 750 m indoor