Perfect for the on-board or on- the- road active user who needs to convert 12 volt battery power to 110VAC. Our patented cup holder design allows for up to 150 watts of AC power at the convenience of your closest cup holder or any flat surface. While on the water or in your car, power your home electronics. Built in safety: polarity, low battery, overload & over temperature protection. Size 2.65"(dia.). 6.25" L x 2.5" W x 9.25" H.