ApplicationFor single 10 inch, 12 inch, 14 inch, 16 inch Fans For 2 x 8 inch Fans,2 x 10 Inch Fans,2 x 12 Inch Fans,2 x 14 Inch FansSpecificationPackage Include: 1x Thermostat Switch 1x Relay Wire Harness 1x 3/8\" NPT Thread-In Probe 1x In-line Fuse Holder 2x Ring Terminals 2x Fan Pigtail Connectors 3/8\" to 1/2\" Adapter 30 & 40 amp Fuses Just As Picture Showed Working Voltage:12VNote- Professional installation is highly recommended (No Instruction Included) - For any needs please contact us