DIY 3 in 1 Design: This four-hole panel includes 2 QC 3.0 USB charging sockets (output: DC 18W Max) + 12V power socket (output: DC 12V) + ON-OFF rocker switch, they are interchangeable. You can also replace any ports with additional USB sockets or any other suitable means. Two waterproof QC3.0 USB ports: the cigarette lighter socket comes with two 18W/3A QC3.0 USB ports. up to 4x faster than traditional chargers. Universal for all 12V-24V cars, buses, RV, ATV, trucks, trailers, boats. marine and more. Voltage display and safety driving: Digital voltmeter display. The real-time LED voltmeter can remind you whether the voltage is at a normal level to ensure safe driving . The blue light is perfect for nighttime use.Note: The voltage reading will not be visible until this outlet has power and the user turns the button on. Flexible charging: 1 cigarette lighter sockets are enough to use multiple portable devices simultaneously, such as GPS, dashboard, DVD player, FM transmitter and other small devices in your 12V~24V vehicle. Independent toggle switch: USB charger panel designed with independent on/off switch, which saves more electricity and extends product life. You also don't have to worry about draining any power. Sold by Briday Store