USB port, plug and play, very convenient. Need 5V 2A power bank, mobile power or charging plug (not included) for power supply, largely prolong the time of your camera. Suitable for 550D, 600D, 650D, 700D DSLR cameras. Adopts multi-conservation technology, such as short circuit conservation, over-voltage conservation and over-current conservation, which ensures the absolute safety during use. Cable length is up to 1.5m. Long enough, very convenient to put your own power bank or mobile power in 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:7.4V Power Supply: Power bank, mobile power and charging plug (not included) conservation: Short circuit conservation, over-voltage conservation and over-current conservation Cable Length:1.5m Item Weight:50g/1.8oz Note:Please use 5V 2A(output) power bank/mobile power for power supply, if not, the item can not work normally. Color:Black Material:plastic Package Contents: 1 * -E8 Dummy Battery 1 * DC Power Bank USB Adapter Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.