This horizontal lifeline system's innovative retractable design allows users to quickly and efficiently set-up any length of system (up to 60') in only seconds and dismantle it just as quickly. After installation workers are able to attach to the cable lifeline with their fall arrest system and begin work fully protected. This unit will provide complete horizontal mobility and hands-free fall protection for two users per span up to six users per system. A built-in pre-tension indicator ensures the lifeline is correctly tensioned minimizing dangerous fall clearances. The impact indicator produces visual proof of a fall arrest. The entire system weighs only 25 lbs. and is retracted into an easy-to-carry case.