JST-RCY connector so I could power i from one of the small LiPo batteries I keep on my bench. The fan uses .5A, so the battery in the picture will keep the fan going for two hours without problem. I measured this with my watt meter. If you are doing anything with RC or motors you should have one.
If I would have had a spare 3-pin or 4-pin JST-XH I would have used that, so that it could have been powered off of any battery's balance port.
Here it is in action, shot with genuine shakycam: