Yes it can. Just like a Japanese PS2 controller can be used on a North American PS2. The controller just uses bluetooth to connect to the PS3, there is no "region bluetooth" or anything like that.
Question aside; This controller is amazingly light. I honestly didn't think it were possible to get any ...[§ó¦h...]
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Official 6-axis wireless controller
Connects via bluetooth (wireless) or USB (wired)
Lithium Ion rechargeable battery pack built-in
Battery running time: Around 30 hours
Play & Charge technology: Recharge battery pack when connecting via USB
DIY SIXAXIS I don't use the virbration at all, always switch it off, so I was not happy with the extra weight of the DualShock. But I unscrewed the controller open, and just cut the wires of the 2 vibrating motors, bingo! My DS is now a SIXAXIS. Those wires won't affect the controller at all.
Don't get me wrong I love the ps3 and I love the shape of sony's controllers. But the six-axis controller is horrible. no rumble, too light, and feels like a toy compared to the dualshock controllers. If you want PS3 controllers, order a Dualshock 3 controller from Japan. Comes in white or black, and has DIRECTIONAL rumble and keeps the six-axis.
PC Usage Yes, it can be used on a pc using certain drivers available on the net. I would post a link but im not sure of Play-Asia's link policies. Ill be buying these in anticipation for the EU launch, and for use on my PC. The sixaxis tilt sensors dont work just yet on a PC though.