Universal Battery Disconnect Switch - Supports 12V and 24V systems, rated current 250A, instantaneous current 750A. The battery cut off switch 12v is suitable for a wide range of vehicles including cars, trucks, boats, RVs, campers and so on Extend Battery Life & Prevent Drain - The marine battery switches cut off battery power effectively to prevent unwanted drain during storage or downtime. This boat battery switch helps prolong battery life and protect your vehicle's electrical system from accidental discharge or leakage Dependable Protection - The battery kill switch is built with pure brass for excellent conductivity, Constructed with a rugged build, this sturdy battery disconnect assures continuous performance amidst challenging conditions, ensuring lasting protection for your vehicle's electrical management Easy to Install on Battery Negative Terminal - The battery shut off switch 12v only work for the negative terminal of battery. Connect the negative wire to the other side of the switch, no additional wires to connect Peration Mode: ON-OFF Current Rating: 250 Amps Operating Voltage: 24 Volts (DC) Contact Type: Normally Closed Connector Type: Plug In Terminal: Screw Please Notice - The adjustment negative terminal hole is 0.394-0.827inch (10-21mm). Installation guide not included, Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly, Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color:Black Material:Plastic+Metal Package Contents: 2 * Battery Disconnect Switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.