Universal fit: Compatible with all automobiles, boats and devices equipped with a 12 volt power source Circuit protection: Power relay-safety protection and conversion circuit. Blade fuse protects the circuit when overcurrent or short circuit occurs. Illuminated switch: 3 pin on/off rocker switch with red indicator light when truing on, easy to turn on or off, has been passed test of 5,000 times pressing. Two available leads: With 2 sets of light output connectors for dual lighting fixtures less than 180W, the connection is more stable. Package include:1 x wiring harness kit, 1 x instructions. Size:16AWG Wiring Harness Kit – 2 Leads Product Features: 10ft wiring harness, 2 sets of connectors to light fixtures illuminated on/off toggle switch – can easily turn on/off the lights. Inline blade fuse & relay – multiple safety protection. Note: Maximum Wattage: 180W; Max Ampere: 15A Operating Voltage: 12V DC Power Please finish the installation by professionals or install the wiring harness under the guidance of professionals.