Stops power surges from damaging your amps. Mount on panel or firewall. Unique push button reset can also be used as a kill switch. High tech water resistant housing. Rubber boots for water proction. No more spending money on replacing fuses. Features - Color: Black. - Material: PVC. - Size: 5.57 x 3.70 x 3.80cm/ 2.19 x 1.45 x 1.49 inch. - According to the arrow direction, manual reset, you can continue to use. - Insulated cover, covering the screw, avoid direct touch with the metal, play a protective and protective role. - Typically be used for auxiliary and accessory circuits for boat, marine, RV, caravan, winch, tractor, truck and ATV applications. - Also can be used as an on/off button switch for the battery or DC sound amplifier system. - Protect your trolling motor from electrical damage, prevent excessive current and stop power surges from damaging amps.