USB port, plug and play, very convenient. Need 5V 2A bank, mobile or charging plug (not included) for supply, largely prolong the time of your camera. Suitable for 550D, 600D, 650D, 700D DSLR cameras. Adopts multi-protection technology, such as short circuit protection, over-voltage protection and over-current protection, which ensures the absolute safety during . Cable length is up to 1.5m. Long enough, very convenient to put your own bank or mobile in your pocket or bag, or at somewhere else. : -E8 Camera Models: For 550D, 600D, 650D, 700D DSLR cameras Input: USB 5V 2A Output: 7.4V Supply: bank, mobile and charging plug (not included) Protection: Short circuit protection, over-voltage protection and over-current protection Colour: black Material: ABS Size: Line length: 1.5m Package Contents: 1 * -E8 Dummy Battery 1 * USB data Cable Note: Please 5V 2A(output) bank/ mobile for supply, if not, the item can not work normally. Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.