How to choose buttons: For a better fit, you should choose short/2" or long/2.5" buttons depending on the thickness of your countertop. In most cases, "short" is suitable for stainless steel sink tops, and "long" is suitable for thicker countertops such as granite, marble, quartz, etc. Safety: The power cord is UL certified, ensuring safety and long-term use. Suitable for voltages from 110V to 130V. Easy to install: no installation tools required, it can be plugged into an outlet for use. No additional screws required. Excellent compatibility: It can be used with any garbage disposer (2HP), perfectly compatible with Waste King, ISE, Moen, GE, etc. Note: Counter hole diameter should be between 1 1/4 inches and 1 4/5 inches. Fits standard sink holes for soap dispensers.