Pre-wired for you to easily install in 12V-24V cars, RV, caravans, trailers, buses, boats, yachts, marine etc. 4.2 A Fast dual USB charging ports, charging your phones, tablets, cameras, GPS, wireless headphones, etc. Usage: for headlight switch, fog lamp switch, car refrigerator switch, car cleaners switch, horn switch, pump switch Built in safety to protect your devices from overcharging and ensure the circuit won't be burnt out if wrong wiring,excessive heat and current Splash-proof panel face, water resistance caps and anti-seepage rubber ring,waterproof board.<br><br>Output Voltage: DC 12V/20A, 24V/10A USB Output Voltage: 5V USB Current: 4.2A Voltmeter Display Range:6-30V Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:As Shown Material:Plastic<br><br>Package Contents: 1 x Rocker Switch Panel<br><br>Only 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.