I recently got one of these on auction. Mine is not branded and the controls are marked with pictograms but it looks the same otherwise. It came with a cable for Nikon D3, D700, D300 etc. Cost was about ten dollars, including delivery.
The socket on the control is a 3.5mm headphone job. My Pentax cameras have 2.5mm sockets for remotes. I happen to have suitable cable that came with a JBL headset, so I tried it with a zombie *ist DL that I have. The thing takes dark pictures (sensor died?). It came with a Pentax 75-300mm that I just had to have. Just the thing to test the rig, no worries about breaking anything when it's already broken, hehehe.
The rig seems to work, sort of. Bulb exposures work great. Press button, shutter opens, watch seconds tick away on the remote display, press again, shutter closes - just what I need.
You can half press the button on the remote to autofocus, but this is fiddly. The plug on the camera doesn't quite go in all the way and sticks out about a millimeter. The AF half press only works when I push the plug all the way in on the camera. I could file down the tip of the plug, but I'm not keen on breaking my JBL headset. So I will have to get another cable, which will cost me more than the remote itself. Now that I think about it, why do I need to do AF remotely? Oh well...