Introduction:
With full decoded BLN-1 DC-coupler and customized USB cable built-in intellgent circuit board(improve DC output from 5V to approx 8.0V), you can connect this USB with DC 5V 2A-4A power source. Such as power bank.Connect the USB plug to power source and put the coupler into the camera battery compartment to provide stable and continuous power supply for your camera.Enables you to use external power source with your camera to achieve long time shooting, no need to replace camera battery again and again. 
Features:
Input: 5-5.5V 2A-4A
Output: 8V
DC Port：DC 5.5*2.1mm
Conversion efficiency: 87% (DC-DC Efficient conversion rate)
USB plug Specifications: USB2.0
Total Length: 200cm
Compatible Battery/Charger Part Numbers:
OLYMPUS BLN-1;BLN1
Compatible Camcorder / Camera Part Numbers:
Olympus OM-D E-M1
Olympus OM-D E-M5
Olympus OM-D E-M5 Mark II
Olympus PEN E-P5
Olympus PEN-F
Package including:
1 x Full Decoded DC-Coupler with USB cable