USB port, plug and play, very convenient. Need 5V 2A energy bank, cellular calories or charging plug (not included) for energy supply, largely delay the time of your camera. Suitable for 550D, 600D, 650D, 700D DSLR cameras. Adopts multi-protection technology, resembling quick circuit protection, over-voltage defense and over-current protection, which guarantees the absolute security throughout use. Cable size is as much as 1. Long enough, very convenient to place your own energy financial institution or mobile power on your pocket or bag, or at somewhere else. Model: -E8 Compatible Camera Models: For 550D, 600D, 650D, 700D DSLR cameras Input: USB 5V 2A Output: 7 Power Supply: Power bank, cellular calories and charging plug (not included) Protection: Short circuit protection, over-voltage protection and over-current protection Colour: black Material: ABS Size: Line length: 1 Package Contents: 1 * -E8 Dummy Battery 1 * USB data Cable Note: Please use 5V 2A(output) energy bank/ mobile energy for strength supply, if not, the item can not work normally. Only the above package content, assorted item are usually not included. Note: Light and various displays may cause the colour of the object within the photograph a little assorted from the genuine thing. The dimension allowed error is +/- 1-3cm.