The MK Electric Lighting Doorbell Chime with Lighted Rectangle Buttons install quickly into a standard one-gang dual-voltage wall box making them perfect for any home. Even better, each purchase has two lighted rectangle doorbell buttons included. At MK Electric , we’re always looking for ways to make your light better. We continue to innovate, challenge our thinking and improve our processes. We look to earn your business by delivering progressive lighting solutions designed to balance value with the highest design performance possible.