This electronic cigarette clearomizer is produced by Vision, who also makes the VIVI Nova.
This clearomizer can be recognized by the trademarked "V" on the bottom part of the head, as seen in the photograph.
CE4 is a standard term used to describe a particular style of atomizer, and includes any number of off-brand and unknown-brand products. This particular atomizer is sometimes known as the CE4+, Vision (named after the brand), Vision eGo, CE4 V2, CE4 Longwick, the Stardust, or the Saturn.
The important thing to look for in an authentic Vision-brand CE4 is that it is branded with the Vision "V" and that it's the CE4 style.
This atomizer features a replaceable head, which can also be rebuilt with your own wire and wick if you are the tinkering type. It also has optional specially made drip tips, or a drip tip adapter which will allow for the use of any standard 510 drip tip. This unit attaches to the outer cone threads of an eGo battery and is NOT 510 threaded. A 510 to eGo adapter can be used to attach this atomizer to a MOD or any battery which is non-eGo type.