Hack it! Key

If you are traveling to any of the countries using BS 1363 Type-G 3-pin plugs (220 - 240 v) and all your devices are Europlug Type-C 2-pins plugs (220 - 240 v) you definitely need to print the "Hack it!" key !
Put it in your key chain and you are good to go!
No more bulky sparky converters, just insert the key in the earthing socket to unlock the other 2 pins.

Below link lists down all types of plugs and countries using em.
LINK: http://www.worldstandards.eu/electricity/plugs-and-sockets/