Description: For car truck marine boat audio/video system overlord protection. Stops Power Surges from Damaging Your Amps. Easy to operate with manual reset arm. No fuse change trouble & headache. Unique Push Button Reset can also be used as a Kill Switch. The 4-Gauge Power Wire/ Ground Wire Ring Terminals included,5/16"(about 8.5mm) Stud ring diameter. Self-Testing & Manual Override. High Tech water resistant housing. Mount on Panel or Firewall. Specification: Material: Plastic & Copper Size: approx.8cm*5.1cm*4cm Color: Black Voltage: DC 12V-24V AMP: 120A Package Includes: 1 x Circuit Breaker 2 X Red Boot 2 X Black Boot