DIY Four Hole Panel Base; Dual USB Socket + Voltmeter + 12V Outlet + Toggle Switch. USB socket output: DC 5V / 4.2A; Power outlet: DC 12V; Voltmeter display range: 0 - 24V. Small size and excellent performance.Easy to install, convenient to use.Widely used for car, truck, Rv, ATV, boat, etc. About the switch hole, It could be used for a cigarette. Can Not be used to light cigarettes.If you don't need the switch for a while. So enjoy it depend on what you wold like it to be. It has two different use, why not ordering it now Widely used with electric equipment for power supply:Vehicle,GPS,DVR, mobile phone, camera. Tight cap of Cigarette lighter socket protect the ports when not in use. Waterproof or Dustproof for the interior or exterior application. Fitment: Fit for many vehicles(Car,Boat,Motorcycle,Marine,UTV/ATV,RV,Truck,Camper Vehicles) to install the dashboard area where use mobile Specifications: Color: Black Material: ABS Voltmeter socket dimension: Approx. 2.8 * 1.6cm (Screw Diameter * Height) USB socket dimension: Approx. 2.9 * 4cm (Screw Diameter * Height) Power socket dimension: Approx. 2.9 * 4cm (Screw Diameter * Height) ON-OFF Toggle Switch: Approx. 2.9 * 1.8cm (Screw Diameter * Height) Four hole panel dimension: Approx. 10.5 * 8.7 * 0.5cm (L * W * H) Switch AND Voltmeter : The switch easy to control and with the blue light to remind poeple when the switch on. Voltage display can timely display the battery voltage whether in the normal use range or not and with blue digital display to let you know the battery's voltage accurate data. Dual USB AND Cigarette lighter: Input: 12/24V only; Output: 5V-4.2A(2.1A+2.1A),with LED diaplay. devices easily. Gentle Reminder:Gentle Reminder: Check maximum voltage on devices to charged in advance. Package Contents: 1 X Four Hole Panel Base 1 X Dual USB Socket 1 X LED Voltmeter 1 X Power Outlet 1 X ON-OFF Toggle Switch 9 X Insulated Terminals 4 X screws Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.