All STTS (Soft Tactile Transducer Sensor) mats are homerun wired back to the safety relay controller and are continuously pulsed. This verifies that each safety mat is wired properly and is connected to the mat controller. Unlike open switch steel mat systems, the STTS controller pulses and monitors the safety system. This verifies that the mat wiring has not been bypassed, jumpered or shorted outside of the control box and prevents against an automatic reset of the control (green) with an unsafe condition present. Our extremely durable safety mats are available in any shape or size. Unique mat designs are our specialty!