Includes an oil heater and battery warmer that are thermostatically controlled to heat up when the temperature drops. Ensures smooth engine starting and engine operation in cold weather climates. Helps protect your engine and keeps your generator ready for operation. The oil heater and battery warmer feature a pre-wired hook-up so there's no need for extension cords. They turn on when temperature drops below 40-degrees Fahrenheit and turns off when temperature goes above 40 degrees. For Briggs & Stratton home generator systems 170469, 1704691, 1704692, 1704693 and 1704694.