The outlets in Hong Kong are Type G, and run at 220V. Laptop adapters these days should all be voltage agnostic, but just don’t try plugging your old electric razors into these …

Another word of advice, for those of you bored by long flights and vexed by short battery life. Check SeatGuru to determine which seats on your aircraft have EmPower outlets. You can purchase EmPower adapters for your laptops that will let you run AC power throughout your flight, allowing you to plow through the latest season of LOST or The Wire without losing juice.