This easy-mount dome light from T-H Marine is ideal for interior use in boats and RVs. Circuit board is completely sealed in epoxy to resist water, corrosion, and vibration. UV-stable dome has a clear PC lens pattern uniquely designed to distribute the illumination to a wide beam angle no less than 120°. Super flux LEDs in this dome light are super bright with a long life span up to 100,000 hours. Low power draw. Hidden fasteners for clean installation. On/off rocker switch on bezel. 4" diameter.