Wide Application: This 4 way power distribution block is suitable for the amp or audio/stereo system, solar panel, battery of automotive for camper, truck, marine/boat, , car, trailer, UTV, etc. Reliability and Practicality: The black base and transparent shell design with high-quality plastic, which is durable and protects the equipment from external damage. Transparent shell allows to observe the status of the fuse directly. Connection terminal made of zinc alloy. 4 Way Fuse Block is heat resistant and flame retardant. Red Light Indicator: This 4 way power distribution block equips with 4 red indicators. When one or more fuses are blown, the red light will light up and help you identify the status of the fuse and easily replace the blown one. When the lights remains extinguished, all is well. Multiple Mini-ANL Fuse and Interface Options: 4 way fuse block can be used for both power and grounding, Input: 2 x 0/4 Gauge, Output: 4 x 4/8 Gauge. Fuse block comes with 2×60A fuses, 2×30A fuses and 2×80A spare fuses. On-demand connection! 2 wrenches are provided to make installation easier. Automatic Protection Circuit: The car audio 4 way power distribution block is mainly used to connect the audio/amplifier power cable to the audio system to prevent excessive current, avoid overheating of the wire. The circuit will automatically disconnect to protect the device when the current is too strong.