This special design offers high reliability. The Stainless steel and aluminum housings can withstand abuse, making it very durable, and the housing colors and legends are chemically bonded to the metal surface. They will not wear or fade. Each keypad is polymer sealed. This makes them submersible and suitable for wash down environments. Drawbacks include high cost, the need for external power in the toggle and 30-second momentary versions and the lack of tactile feedback.