3in1 Power Supply Voltmeter Multifunctional Power Box Car ChargerFeatures:Outdoor camping uses a battery box, installed in an RV, installed in a yacht, and other DC 12/24V power supplies.The car charger function can charge electronic products such as mobile phones and tablets.The power socket can be used with some automotive supplies for power supply.The voltmeter can observe the power level of the power supply in real time.With independent switch control and 20A overload protector protection.Specifications:Item: Multifunctional Power BoxMaterial: AluminiumProduct Input Voltage: 12/24VUSB Output: 5V 4.8A (2.4A+2.4A)Rated Voltage and Current of Cigarette Lighter: 12V 20A/24V 10AMeasuring Range of Voltmeter: 5-30VSize: 210*70*70mmPacking Size: 24.6*10*9cmPacking Weight: 694gPackage List:1* Multifunctional Power Box2* Fixed Accessories8* Screws