I understand the item is from Japan, it gave us a slight problem syncing to our Wii at first. It is now fully charged with our rechargable battery pack and synced to the Wii. Online stated it was with motion system, though it does'nt state that on the bottom of the remote like the US version. Not a big deal though.
If you purchase this from "JK Games," be aware that this is NOT an official Nintendo OEM remote manufactured for the Japanese market. Instead, it is a cheap Chinese-made knockoff with no Japanese characters to be seen anywhere on the imitation Nintendo box. In addition, the box says it is "compatible with Wü" - yes, Wü with an umlaut. Enough said.