# Power supply The node is supplied with Sunny SYS1381N-1209-W2E power adaptor, 90-264 VAC input and 9V, 1.33 A output. The connector accepts standard DC-plugs with outside diameter of 5.5mm and centre hole diameter of 2.5mm. Outside pole: minus, centre pole: plus. --- # 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://help.boomerang3.com/s2-radio-system-manual/s2-system-description/s2-node/power-supply.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.