This 12V replacement power adapter from myVolts is compatible with Roku 3 Media player.
The plug fits a US 2-pin wall power socket. Note: This adaptor has been tested, and it is suitable for the Roku 3 purchased from the US that requires 12V.
This power adaptor is designed to meet the power specification of the 3 Media player referred to here - it is the correct voltage, amperage and tip size.
It meets and exceeds all US safety standard, features overvoltage, overcurrent and short circuit protection to protect your device.