The Harken Single-Function Digital System Switch in bronze with the Version 4 "start" icon. Harken Digital System Switches are built for reliable control of electrically powered yacht systems. The waterproof button sends a binary code that the decoder must verify before anything starts, and two command switches under the button must work together before a signal is sent, so damaged wiring or water ingress can't cause unintended activation.

Watertight seals are never exposed to sun, the switch resists impact, wear and abrasion, and integrated lighting gives low-light visibility. An adhesive mounting option is available where drilling isn't wanted. This single-button version is used with single-function systems such as the Harken UniPower single-speed winch.

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