5V 3.0A/1.5A Dual USB Motorcycle Cigarette Lighter USB Charger with Voltmeter 
  Specifications:
  product material: ABS plastic+Aluminum alloy+Rubber
  Input voltage: DC12V-24v
  Output voltage: 12V/5V
  Output current: 3.1A/1.5A
  Product line length: 150cm
   
  Product use:
  It can supply power to mobile phones, tablets, GPS, etc. It can also be used for car refrigerators, vacuum cleaners, etc. The voltmeter can detect battery voltage.
   
  Wiring instructions:
  The red wire is connected to the battery positive +, the black wire is connected to the battery negative -
   
  Product advantages :
  1 3.1A super large current, can be used for mobile phones, tablets, navigation, GPS, etc.
  2 The product has a waterproof cover, which is safer to use.
  3 The prdouct comes with a voltmeter, Voltmeter test range: 5-16V
   
  Item includes:
  bracket *1;
  rear view mirror fixed bracket *1;
  point cigarette holder *1