[. . . ] Do not install this product in a place where it could distract you or another driver from the road. [. . . ] If your car is parked in direct sunlight and there is a considerable rise in temperature inside the car, allow the unit to cool down before use. Do not use the unit on a weak battery as its optimum performance depends on a good power supply. For safety reasons, keep your car audio volume moderate so that you can still hear sounds outside your car. If no power is being supplied to the cassette player or tuner, check the connections. As you will need to drill some holes to install the metal fitting, check the underside (under the car, or in the trunk) of the mounting location carefully to make sure there is no fuel line, fuel tank, or electric wires, etc. Caution Choose a location under which no fuel line, fuel tank, or electric wires are present, because the metal fittings will be attached with tapping screws. Mark and drill the screw holes in the car floor panel, then use the screws 3. As there is no low-pass filter built-in to this unit, be sure to adjust beforehand the amplifier you connect to (we recommend a cut-off frequency of 30 - 500Hz). [. . . ] As there is no low-pass filter built-in to this unit, be sure to adjust beforehand the amplifier you connect to (we recommend a cut-off frequency of 30 - 500Hz). [. . . ]