Abus ls1020 ecoline infrared light beam abus ls1020 p the abus ls1020 ecoline infrared light beam is easy to install and for both indoors and outdoors the light barrier monitors an area of up to 20m smart anti sabotage protection of the transmitter and receiver guarantees the highest level of operational safety making it ideal in combination with our alarm systems for monitoring hallways doors or parking spaces p p clever solutions such as video monitoring system control or illumin