HAIRBEAURON 4D Plus straight hair iron equipped with Bioprogramming technology. - Model Name: HAIRBEAURON 4D Plus - Type: Straight hair iron - Function: Bioprogramming When used, it makes your hair very shiny and silky smooth. I love it. I already own one, and I bought another one to use when I'm out, but I ended up not using it, so I'm putting it up for sale. I've only used it once, so it's almost like new. I purchased it at a local hair salon, and the salon's stamp is on the warranty card. Please purchase if you understand this.