This unit incorporates a lifeline that extends and retracts automatically, allowing unhindered movement around the work area. A brake activates in the event of a fall, stopping the worker within inches and limits arresting forces. Thermoplastic housing is lightweight, compact and durable. A Swivel top and self-locking snap hook body connector limit twisting. The galvanized steel cable provides added corrosion resistance. The impact indicator produces visual proof of a fall arrest.