Suitable for architectural applications where aesthetics and superior performance are required. Injection-molded acrylic panels, ultrasonically welded to eliminate visible hardware. Chevron directional indicators available. The typical life of the exit LED Lamp is 10 years. Emergency operation: Sealed maintenance-fee nickel-cadmium battery that delivers 90-minute operation. Recess mounting for top, back or end capability. Top mount option available for non-emergency exits. Five-year limited warranty.