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With four visibly marked blade terminals this relay can be used with horns, compressors, power trunk and many other applications (up to 40A circuits). Made out of black durable plastic water proof case. This kit includes a Pre-wired Relay Plug which has each of the four wires color coded for an easy, clean and professional installation without the use of any special tools and a universal momentary horn button switch that can be used with any brand or model horn that requires a switch for activation. Universal 4-PIN Relay with Pre-wired Plug 40 Ampere / 12 V Handle High Current Applications Makes installation fast, trouble free and professional No special tools required Designed for any 12V vehicle Ideal for horns, compressors, alarms, headlights, fog lights, trunk release and many other applications Included in this kit: 1 x 4-PIN 40A 12V Relay 1 x 4-PIN Pre-wired Relay Plug 1 x Momentary Horn Switch