15V / 4.2A dual USB charger, with two USB charging ports, one of which is a 2.1A output - you can charge 2 devices at the same time at high speed 2Wide application - universally suitable for DC 12 V - 24 V vehicles, boats and marine, motorcycles, trucks, SUVs, UTVs, etc. 3Built-in 10A fuse protects your devices from overheating, over-current, over-voltage, overload, under-voltage and short circuit 4Waterproof and heat resistant - has a waterproof cover and is suitable for high and low temperature environments (-20 C to +60 C) 5Easy installation - the hole diameter is 3 cm It fits most vehicles control panels and rocker switch + to positive pole, - to negative pole A tight-fitting cap protects the USB ports when not in use You can also connect an on/off switch and then turn off to save energy NOTE: 1. The size of the product is measured manually, and there will be an error of 2-3mm due to factors such as different measurement tools and measurement methods. 2. This product is all taken in kind, but due to differences in photography, lighting, color deviation, and personal understanding of color. As a result, there may be some color difference between the actual product and the photo, and the color is subject to the actual product. 3. Please take good care of our products