Request to Exit Switch in the closed position. HVAC Control Switch Example of an hvac, heating, ventilation & air conditioning control switch. HVAC Control SwitchAlternative example of an hvac, heating, ventilation & air conditioning control switch. Capacitive Switch Back View An ITW Chameleon Capacitive Switch showing the back view with communications module. Capacitive Switch Rear ViewAn ITW Chameleon Capacitive Switch showing the standalone version without communications module. Capacitve Power Symbol Power symbol, momentary maintained timed switch. Keypad Red LEDConfigurable capacitative switch. REX Swipe Request to Exit Switch. Light DimmerConfigurable light dimmer switch.