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Overview OPTO-TOUCH Optical Touch Buttons are zero-force ergonomic replacements for mechanical push buttons. OTB models are momentary-action touch buttons with electromechanical relay or solid-state outputs. LTB models are alternate-action touch buttons with electromechanical relay outputs. Banner Insider eNewsletter Helpful application information, new product updates, answers to frequently asked questions, and more. Subscribe Now » Food & Beverage Is your line competitive? Innovative, high-quality solutions for every phase of production. Enjoy increased accuracy, greater productivity, cost savings. Learn more » Worldwide Distributors Banner has more than 2,000 distributors worldwide — ready to help you. Zip Code: Find international distributors