DIY Design Model: This six-hole panel includes Dual USB Socket + LED Voltmeter + 3 Way 12V Power Outlet + ON-OFF Toggle Switch; They are interchangeable, you also can replace any port with additional USB outlets, or anything else that fits. Wide Compatibility: Fit for Car, Marine, Boat, Truck, RV, ATV, Camper, Vehicles and other 12/24V Devices. Widely used for mobile phones, Tablet, GPS, digital cameras, PDAs etc. USB Socket Safety Protection: USB Output: DC 5V / 4.2A; It’s certified by CE & ROHS with Overload, Over-current and Short Circuit Protection to ensure charging safety, meanwhile, built-in converse connection protection that ensures the circuit won’t be burnt out if wrong wiring. Voltage Monitor Safety Driving: The LED voltmeter shows 0-24V voltage when driving which can remind you whether the voltage is at a normal level, ensure driving safety. Flexible Charging: 3 Cigarette lighter sockets enough for simultaneous use of a variety of portable appliances, like