No Physical Wire present but 3 Wireless Beams will create a Virtual Trip Wire up to 250 Meters long Multiple units can be cascaded to create a Virtual Fence several Kilometers long When 2 or more beams are broken, the Trip Wire activates Local Strobe Light with Siren and SMS Alert through LoRaWAN Performance not affected by to rain, fog or sleet No High Voltages, only 12 Volts DC used Outdoor Weatherproof Enclosure