ok we buy this after a article about a inexpensive solution for shooting `` tethered '' but wirelessly with the Nikon d4 , which have a ethernet port . the idea be that you could use this thing to basically convert the eth port to WiFi so that you could send photo directly to you computer or ipad or whatever . shoot , photo be send to computer , do . the Nikon solution cost like , $ 900 , so this seem like a good option . the problem be that this thing require external power to run , so now you be either need to be plug into a wall or you have to buy a batter pack of some sort , which increase the size and awkwardness of use you camera . the d4 be already a huge camera already . the other thing be that this do not even include a power cable , and without a battery pack , it be totally worthless to I .