# Ignition source Some devices do not allow connecting the ignition cable to the device input to transmit the ignition status. Instead, they use virtual ignition based on the motion sensor readings or the vehicle's onboard voltage. When the engine is running, the vehicle's power supply is provided by the vehicle's generator, which typically has a higher voltage than the battery. The voltage is higher and allows the ignition status to be determined. The ignition detection by the movement sensor is convenient if the device is not connected to the vehicle's onboard electrical system. However, when the vehicle is towed, the ignition will also be detected as the vehicle moves, although the engine will not start. The ignition source is selected from a drop-down list. If the ignition source is the onboard power supply voltage, the range of values in which the ignition is considered switched on must be selected. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://navixy.com/docs/user/guide/devices-and-settings/vehicle-sensors/discrete-sensors/ignition-source.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.