Soft blue light for evening use. Unique design allows use with most stainless steel and plastic beverage holders in current boats. Made from opaque polymer material and acrylics. UV-enhanced foam insulator pad adhered to inside bottom. Built-in drain hole. Pressure sensitive switch on bottom. Four little 3/16″ legs for stability. A stand-alone part with a captive battery supply (3) AAA batteries (Not included) and a 3-way on/intermittent/off switch.