The LG Remote Temperature Button Sensor, Model ZRTBS01, is a Type 3, NTC temperature sensor, providing fast and accurate temperature readings. The sensor is suspended in a round enclosure that is easy to install and discreet, measuring less than 1 inch in diameter. The sensor requires a 7/16-inch hole at its mounting location and is secured to the wall with a peel-off tape strip. Only a flush 7/8-inch dot on the wall is visible. The sensor can be painted with typical interior wall paint. The Remote Temperature Button Sensor is compatible with all LG indoor units, except wall-mounted units.