Our patented Belay in the Box™ auto-belay is the safest auto-belay system on the market. The Belay in the Box™ is the only redundant auto-belay available. Using two pressurized hydraulic rams specifically designed for human lift, there is always a backup ram for safety, ensuring twice the coverage at all times. Each ram uses a custom designed check valve that controls the flow and pressure of the auto-belay system that is monitored by a pressurized tank. This air tank provides the climber with pressure in the system at all times and also has a sight glass to monitor the fluid level. If the pressure were to fail, the check valves are designed to operate one more time by lowering the climber safely to the ground before completely shutting off for repair. The Belay in the Box™ is the #1 auto-belay system used in the climbing industry. Beware of imitations this is the only auto-belay system designed for high-cycle use.