High-performance stable IC, stable output current, USB car charger + cigarette lighter socket capacity for general navigation, charging Wiring : The back of the charging stand is marked with + -, which can be connected to the positive and negative poles of the supply.Installation range: The product is suitable for all with 12-24v voltage, RV, yacht, , Construction vehicles can be installed and used.Installation : first use the hole opener, put the product in, and then tighten with the threaded ring 1. USB socket and cigarette lighter can be used with USB to support a variety of electronic products.2. USB with LED indicator, voltmeter blue light display.3. High current resistance, high temperature and wear resistance.4. With waterproof cover, it can be covered with rubber cover to protect it from dust and water.5. The wiring has reverse polarity protection, and the reverse will not burn out.6. You can know if the battery voltage is within the normal use range.Product Name: Car RV Yacht Modification 4 Panel USB Charger + Voltmeter +12V Socket + Small SwitchProduct weight: 128gProduct size: length 10.3CM x width 8.5CM x height 6CMInput voltage: 12-24VOutput current: 5V 4.2ACigarette lighter input voltage: 12V 20A, 24V 10AUSB socket dimension: Approx. 2.9 x 4cm (Screw Diameter x Height)Voltmeter socket dimension: Approx. 2.8 x 1.6cm (Screw Diameter x Height) socket dimension: Approx. 2.9 x 4cm (Screw Diameter x Height)ON-OFF Toggle Switch: Approx. 2.9 x 1.8cm (Screw Diameter x Height)Four hole panel dimension: Approx. 10.5 x 8.7 x 0.5cm (L x W x H)Font color:blueColour:blackMaterial:ABSPackage Contents:1 x Four-hole panel1 set x allation accessoriesOnly the above package content, other products are not included.Note: Light reflection 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.