The d.2 is the world's first DJ mixer to incorporate the revolutionary Infinium optical crossfader with adjustable tension. Based on the world's first optical, no-contact design, the Infinium crossfader delivers precise, ultra-smooth response for years... no matter how much you scratch. And without the risk of dust and grime deteriorating its audio performance, this crossfader will sound as good in 10 years as the day you bought your mixer. The Infinium crossfader features an adjustable tension control which can be set using a small screwdriver. So you can customize the fader feel to be as loose or tight as you desire.