UPDATE: CIO+ is now available in versions for both right and left hand traffic
The bike light's design makes it best to mount on the left side of the bike, which functions best in countries with right hand traffic since the light then is closer to traffic. If you should be in a country with left hand traffic the light can still be seen through the spokes.
Alternatively, the light can be mounted upside down on the right side but it will result in a light that points up a bit due to the angle on the front of the lights.
CIO mounted upside down on the right side of the bike.