Airport Power Cord

The AirPort base station itself can work with a variety of electrical outlet power settings, but the socket types between Hong Kong & Canada are completely different. The base stations support a range of 120-240v, 50-60 Hz power sources. The other thing to take into consideration is the radio channels used may differ between these two countries.

The sockets (120v, 60 Hz) used in Canada is similar to those used in the US and look like one of the following:

Whereas in Hong Kong (220v, 50 Hz) they use the following type:

Just for future reference, Apple networking products are regional-specific to support the Wi-Fi standards set by individual or multiple set of countries as required. That is why you may have difficulty using a base station designed for North America in Europe or Asia and vice-versa. The primary issue is not going to be electrical power so much as not violating a country's Wi-Fi laws. This is especially true when operating on the 5 GHz band where there is a possibility it can interfere with governmental or military networks. Just so you are aware.

For power, Apple even offers a World Travel Adapter kit. Although it was meant for non-networking equipment, it would work just as well.

FWIW. If you know that you will travel often to other regions, it may be worth your while to invest in additional base stations. This is true for networking hardware provided by other manufacturers and is not unique to Apple.