High-Brightness LED Light: The upgraded LED doorbell button is constantly lit 24 hours a day and powered by low voltage; it provides clear visibility even in the dark, eliminating the need for visitors to search for the doorbell; it 't overheat or burn out like a light bulb. High Compatibility: Our illuminated doorbell button is compatible with low-voltage doorbell systems and is an ideal replacement for most home or garage doorbell switches. It can be mounted on most surfaces, such as plaster, wood, brick, and stone. Patented Design: This doorbell button is made of waterproof material; temperature range: -4 to 240 degrees Fahrenheit; an ideal replacement for your old, yellowed, cracked plastic buttons. Important Notes: If you use a digital ringtone (plays a melody; a speaker emits sound), a diode is required (not included); if you use a mechanical doorbell (two sounds; similar to a mallet striking a metal bar), a diode is not required., Weight: 73.0 pounds, Manufacturer: UDSKNV[KSL