Switch-Vandal Resistant Illuminated Momentary Switch, 19MM, Red, Black Housing Red LED with black housing 12 Volt DC Switch, separate LED terminals and bright Daylight LEDs On/Off Switch - S.P. Push to make (Momentary Switch). Perfect for use as computer on/off or reset switch. Easy to install, no need for expensive switch panels, Requires a 0.75" (approximately a 19mm) We recommend a 3/4" hole saw Front panel mounting switch comes with O'ring for seal around panel.