Fangrui Product Details This 2 Pack 0-10v Dimmer Knob For Led Lights Is Only Need To Be Connected The 0-10v / 1-10v Dimmable Led Driver. And It Can Be Compatible With Most Of The Led Drivers. The Low Voltage Electronic Pwm 0-10v Dimmer Is For The Led Lights That Have A Separate Dimmer Circuit. Its Specifically Made To Drive A Pwm Circuit Built Into The Light. Dimmer Adjustment Range: 5-, Stepless Dimming And No Flickering Or Humming. Small Size: 0.9x1.3x1.3 Inch (including Knob Height); Wire Length: 13 Inch. Easy To Install. Brown Line Is Dim +,blue Line Is Dim -. Please Note: Do Not Connect It With Ac Power Directly. Colour:black Material: Abs Package Contents: 2 X Led Dimmer Switch Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.