HOW TO CHOOSE BUTTON – For better fitting, you should choose the SHORT/2inch or the LONG/2.5inch button depending on the thickness of your countertop. In most cases, SHORT is for a stainless steel sink top and LONG is for thick countertop like granite, marble, quartz. SAFETY & SECURITY – The Power-supply Cords are attested by UL for security and long-term use. Suitable for voltages from 110V to 130V. EASY TO INSTALL – Can be used by plugging into the socket without tools installed. The diameter of the countertop hole should be between 1 1/4inch and 1 3/4inch. It is suitable for standard sinkhole for soap dispenser, otherwise you need to drill a hole by yourself. EXCELLENT COMPATIBILITY – It can work with any brand of garbage disposals(≤2HP), perfectly well for Waste King, ISE, Moen, GE and so on. NOTIFICATION – Cut the excess hose, do not coil up the excess hose between the button and the control module, as that will make the switch unreliable.