You will find there's 1.35mm DC port for an external power source but its related straight to the 5V line Therefore if you should externally power, we suggest prying open the case and slicing the crimson 5V line in the https://laytnqvfr680880.laowaiblog.com/27976451/a-simple-key-for-qvs-db9-female-to-female-slim-gender-changer-unveiled