... TG (170C) PCB ·Free halogen PCB ·Impedance control PCB ·Different PCB surface finish: HAL, Flash gold, Immersion gold ·Colorful solder mask PCB ... µm-175µm9.Mini Solder Mask Bridge:0.025mm10.Impedance Control Tolerance:l.±5%11.Surface finishing:HASL,LEAD-FREE HASL ... ,V-CUT,Beveling18.Certificate:UL,ISO9001:2000,ISO14001,SGS,ROHS remote-control fan control board