Plug and Play Fused Pigtail, male head plugs into the battery with water tight fitting and female plug in for true plug and play wiring. You can add a 10' Pigtail for your wiring or any of the other pigtails and accessories that can be wired with your FishFinder, Lights or other accessories. These holder uses 5mm*20mm glass fuse. This Fused Pigtail comes with 2 - 3A fuses. These work perfectly with the voltage regulators to insure peak performance with your electrical systems.