Specifications: With smart charging IC, dual USB ports total current is 4.2A and each for 2.1A. It will auto detect your devices and charge 2 devices at optimal speed in the meantime for maximum charging efficiency. Built In LED voltmeter for battery health monitoring, real-time monitor the health of your vehicles battery and electrical system. LED display makes you to check the data at night or in darkness. The wire embedded with a 10A built-in fuse for over-load protection, charges safely and without risk of overheating or damaging devices. Waterproof lid & high temperature resistance, excellent IP66 waterproof level. Made of high and low temperature resistant flame retardant material, its super durable. This USB charger socket fits for DC 12-24V car, boat, motorcycle, ATV, RV, etc. Item Name: USB Car Charger Material: ABS Input: DC 12V-24V Output: 5V 2.1A+2.1A Size: 1.35" x 2.05" (Approx.) Wire Length: 60cm/23.62" (Approx.) Notes: Voltage reading can be visible only by connecting to the battery and the voltage also can be read when the cover is engaged. Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x USB Car Charger 1 x Power Wire