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Touch screen knob / optical
These optical switches are ergonomic with touch-button designs. They require no physical pressure to operate, which eliminates the possibility of hand stress that can lead to repetitive-motion strain. There are LTB OPTO and OTB buttons available. The zero-force design of the OPTO-TOUCH optical touch buttons makes them ideal replacements for mechanical push buttons. The OTB models are touch buttons with momentary-action technology. These features include electro-mechanical relay or solid-state outputs. Alternative-action touch buttons are offered with the LTB models. The STB self-checking touch buttons provide safety for two-hand control input devices and provide optical path and a redundant microprocessor. These buttons also respond to a finger-blocking light. EMI and RFI are available with e/m relays that are rated for 1A switch capacity.