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LED indicator light: blue LED ambient light, convenient to plug in charging cable            
Dual USB ports total  4.2A. Each  2.1A 2 USB Ports            
Battery Voltage and Current Display : Display the voltage of Car battery while no charging and plugged into a power source            
Display charging current when phone is charging. Let you always keep battery state of health            
Built In LED Voltmeter For Battery Health Monitoring            
Current Display, Over-charge Protection: Display the current detected by the Intelligent circuitry while charging.
Intelligent circuit design   protects against short circuiting, over-heating, over-current and over-charging            
Wide Compatibility, suitable for most phones/tablet pc/navigator/PDA/MP3/MP4/GPS, and many more            
Overcharge Protection For Charging Safety

Specifications:

• Material: Aluminum alloy+Plastic            
• Input Voltage: DC12V-24V            
• Output Voltage: 5V            
• Output Power: 120W            
• Output Current: 3100mA max            
• Work Temperature: 0~40?            
• Size: 33*59mm            
• Color: Black                

Package Included:

• 1X Car Voltmeter