# Power Requirements **For PC Work:** Please either use a 2 Amp 5v power supply, or externally power the unit through the ESC breakout. Most computers only provide upto 500ma and the board needs roughly 700mA to boot, before stabilising between 300mA and 400mA with 1 camera attached. **For Deployment:** The board contains a 5v, 3 Amp BEC suitable for input between 5.5v to 36v. This powers the CM4, the USB ports, pin headers and the onboard 3.3v LDO regulator. The 3.3v LDO regulator is normally activated once the CM4 has started to boot. If no CM4 is connected the DIP Switch (2) must be ON to activate. This powers the STM32 and the pin header. --- # 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://wiki.cbunmanned.com/wiki/products-eol/cbu-cm405-fc-eol/power-requirements.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.