Safety & Security: Power module is made of ABS+PC V0 fire retardant material, the US 18awg power cord is attested by UL, the air hose is made of high quality anti-corrosion silicone, which is leak-proof. All for security and long-term useIncludes: Single outlet power module, 5-foot air hose, 2.5-foot power cord, long stainless steel brushed nickel air switch button with a total length of 3.6 ", fixing screws and strong nano-traceless hook stickerInstallation: Just drill a not less then 1-1/4 diameter hole in the sink, counter-top or front of the sink cabinet, place the rubber gasket between the push button and the top of the sink counter. Tighten the plastic nut under the sink counter to ensure a watertight sealNew Version: Patented air button new design, stainless steel top cover, threaded construction, internal strong spring and air cover, never worry fade away and fall off, more elasticity and flexiableNew Power Module Design: Two Installation Methods, you can use screws to fix the power module part, or use strong nano-markless hook sticker to attach directly to the wall. More compact body design, does not occupy space