YASONG SLA FZ7000 100m Crane Laser Anti Collision System, 80dB Alarm, Dual Side Monitoring, RS485 Optional Optional Item:1 Main Unit + 1 Laser Sensor The unit uses power on activation: collection warning lights signal towers The unit uses power on activation: the siren and flashing light start when power is applied and stop when power is removed 2000m remote range in open areas It combines non contact laser ranging with audible and visual warnings to help operators respond before equipment enters a preset risk zone The system supports single or dual sensor configurations and can monitor both sides of a rail mounted crane when equipped with two laser sensors