3 in 1 Multifunctional Car Power Box with USB Charger Voltage Meter for Vehicles 12V 24V Features： 1、Outdoor camping uses a battery box, installed in an RV, installed in a yacht, and other DC 12/24V power supplies. 2、The car charger function can charge electronic products such as mobile phones and tablets. 3、The power socket can be used with some automotive supplies for power supply. 4、The voltmeter can observe the power level of the power supply in real time. 5、With independent switch control and 20A overload protector protection. Specification： Features: 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 Box Material: Aluminium Product Input Voltage: 12/24V USB Output: 5V 4.8A (2.4A+2.4A) Rated Voltage and Current of Cigarette Lighter: 12V 20A/24V 10A Measuring Range of Voltmeter: 5-30V Size: 210*70*70mm Packing Size: 24.6*10*9cm Packing Weight: 694g Package List: 1* Multifunctional Power Box 2* Fixed Accessories 8* Screws Package List： 1* Multifunctional Power Box 2* Fixed Accessories 8* Screws