T Tocas Digital Voltmeter & 12V Cigarette Socket & Double USB Ports Intergrated Aluminum Flush Mount 6 Gang Rocker Switch Panel & Blue LED Indiator for RV Car Boat Yacht 6 Gang 12V/24V Waterproof Rocker Switch Panel with Blue LED for Marine Boat Caravan Double USB ,Power socket and voltmeter Material: aluminium for panel ,ABS and copper for other Short circuit / overheat protection for on-off rocker switch ,USB and voltmeter Suitable for both 12V and 24V systems Panel is pre-wired