The 2009 Mariner Hybrid uses a new, larger 2.5-liter four-cylinder engine linked to an electric motor. The net result is virtually guilt-free acceleration similar to that of a V6. As a full hybrid, the Mariner Hybrid can provide truly guilt-free operation by running solely on electric power in low-load conditions. The Hybrid uses a continuously variable transmission, also known as a CVT, that optimally matches the power and gearing. Standard safety features include front and side airbags for the front seats and side-curtain airbags that cover both rows, four-wheel disc brakes, ABS and tire pressure monitoring. The Hybrid also offers a convenient AC outlet for powering small devices such as a laptop.