Protection Level: IP65; NEMA4X Lifespan: > 5 years. Interface: PS2, USB available. Supply Voltage: +5V DC +/-5% Operating temperature: -10Cto +60C. Storage temperature: -20Cto +70C. Dimensions: 110mm x 83mm Dustproof, Waterproof, Vandalism resistance Mounting type: Rear Mounting Key switch Technology: Silicone switching element Key switch lifetime: > 5 million of operations. Actuation Force/travel: 1N Mounting Rack: Aluminium alloy Lettering: laser engraved legends for excellent durability