Features: Prevent short circuit and fire when working on the electrical system. Simply lift the knife and then the power is cut off. An easy way to disconnect electrical power from any vehicle without tools. Disconnect the battery quickly and easily. Usage: Installed on the negative of the battery, the other end of the for head is connected and extended by the battery connection clip, and the knife blade can be opened and closed to connect and disconnect the power supply. Specifications: Materials: Metal + rubber Size: app.74x47x17mm/2.91x1.85x0.67in Color: As pictures shown Quantity: 1pc Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x Car Battery Disconnect Switch(other accessories demo in the picture is not included.)