Essential Function -- This is a replacement circuit board for LiftMaster Commercial Slide and Swing Gate Operators. It will fix the problem that gate operators do not answer the control commands. Widely Fitment -- Fit for Slide operator SL570 SL575 SL580 SL585 SL590 SL595, and Swing operators SW420 SW470 SW490. Replace OE Part# -- Replace for LiftMaster K001A5566, also replaces 1A5566. High Standard -- This is a high standard aftermarket replacement kit, the main board is made of FR-2 Copper Clad Laminate, all the Japan made capacitors with high precision welding tech effectively avoid short circuit and burn down. Protective Cover on board for excellent insulation, moisture resistance, water and corrosion Resistance. Satisfaction Guarantee -- Yoursme aims to provide excellent products and best service for customers. You can simply return it if you are not satisfied with the product. We support 12 month warranty. Fit for Liftmaster Slide operator SL570 SL575 SL580 SL585 SL590 SL595, Fit for Liftmaster Swing operators SW420 SW470 SW490.