This 5V high-quality replacement power adapter is compatible with the Logitech Alto Business Stand/Keyboard.
The plug fits a US 2-pin wall power socket.
This power adaptor is designed to meet the power specification of the Alto Business Stand/Keyboard 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, and is energy efficient.