USB cable Features:
Input:5V 2.4-4A
Output:8.4V 2A
Conversion efficiency:92%  (DC-DC Efficient conversion rate)
USB plug Specifications:USB2.0
length:120cm
QC3.0 USB Charger Specifications:
Item Type: QC 3.0 Quick Charging Wall Charger Adapter
Interface: USB 3.0
Input: AC 100-240V 50/60Hz 0.5A
Quick Charge 3.0 Port: Output: DC 12V/1.5A, DC 9V/2A, DC 5V/3A
Compatible with:
For NIKON D3100
For NIKON D3200
For NIKON D3300
For NIKON D5100
For NIKON D5200
For NIKON D5300
For NIKON P7000
For NIKON P7100
For NIKON P7700
,For NIKON P7800
Package :
1 x  DC drive cable EH5A/EH5
1 x  DC Coupler EP-5A
1 x  QC3.0 USB Charger 
Warranty:12 months
note:
1.In order to make your camera work better,please use a high-quality mobile power, mobile power bank is output guarantee of at 5V 2 AMP to 4 AMP current. When the power is not enough, will not start or can not shoot properly, Please select a larger current of at least 2.4A, DC 3 Amps or more is better.
2.Do not use the computer USB supply for the camera,because most computer USB 2.0 output voltage is 5V,But the current is less than 500mA.
3. Some mobile phone / tablet usb charger with identification resistance, can not identify the camera, the current can not meet the requirements, it is not recommended.
When you want to long time shooting outside without AC outlet, then you'll feel it's not convenient. Also you can use with a DC 8.4V power bank, but it's not easy to find a DC 8.4V mobile  power bank.
So we provide this solution, with our coupler and customized USB cable built-in intellgent circuit board(improve DC output from 5V to approx 8.7V),Applicable to most mobile power.(DC drive cable,customized production,strict inspection,High quality chip,efficient conversion rate.)