Description: Built-in LED digital display voltage monitor, monitors the health of your vehicle's battery and electrical system in real-time, and allows quick and easy usage in the dark or at night. Dual 5V/2.1A charging ports, built-in smart charging IC, will auto detects your devices and simultaneously chargers 2 devices at optimal speed, better charging performance. Fits for DC 12-24V car, boat, marine, motorcycle, ATV, RV etc. Suitable for charging mobile phones, GPS, digital cameras, PDAs and other USB accessories. IP66 waterproof grade, made of high and low temperature resistant nylon flame retardant materials. Aircraft grade aluminum with premium heat transfer capability for stable power output Specification: Condition: 100% Brand New Power input: DC 12V-24V Power output: 5V 2.1A/2.1A Product Dimension: As picture LED Digital Display Voltmeter Package Includes: 1* Dual Ports USB Charger Note: The voltage reading will be visible only by connecting to the battery and the voltage also can be read when the cover is engaged