Mictuning Universal 2 in 1 Rocker Style USB Charger with Blue LED Light Voltmeter - Dual USB Ports Power Socket for Rocker Switch Panel Upgraded Car Charger - equipped 4 USB ports with total output of 5V/6.8A (2.4A x2 & 1A x2), it enables you to quickly charge 4 electronic devices simultaneously, great for charging most smartphones, tablets, power banks, digital cameras, MP3/MP4 and other USB devices Extended Power Socket - it triples 3 DC outlets from a single cigarette lighter socket of your car, with 120w total power, allowing you to quickly power up multiple 12-24V car appliances, suitable for car refrigerator, vacuum cleaner, air purifier, DVR camcorder, tire pressure gauge, etc Intuitive Voltage Monitor - built in smart IC for voltage auto detection, with LED digital screen, it intuitively and clearly shows you the real time accurate voltage of your car, allowing you to better know of battery condition Reliable Safety Design - it has Over-current & Short Circuit Protection with 10A self-recovery fuse, better ensures charging safety, while the convenient toggle switch is for easy control the whole circuit, effective energy saving Stylish Simplicity - made of durable ABS plastic and PVC sleeve, adopted stain-resistant surface treatment with 2 embedded 3M adhesive tapes on the button for stable mounting, it is simple and stylish that enhances your love car charming