When you are flying on the plane towards Hong Kong, you may want to charge your gadgets. In some planes, you may only find a USB port under the screen in front of you but this port may not be powerful enough to charge devices like tablet or notebook.
If you don't see any power sockets around, just like this Cathay Pacific airplane, try to look under your seat. You may find these:
There are power sockets! They should be able to charge most of the gadgets you have.
Hope this travel tip help you when you fly to Hong Kong next time!
Special thanks: Kelvin Chan for giving this tips