They are currently out of stock, but Griffin also makes a bluetooth version of the PowerMate.
Hope that helps!
Yes they do but I think that is just for Mac os x. If OP is using a mac its fine but we do not know. From that same link:
SPECS
Power Requirement: Two (2) AAA batteries, included
For Mac OS 10.8 and newer
Compatible Mac laptop or desktop supporting Bluetooth 4.0 protocol, including:
Mid-2011 Macbook Air or newer
Mid-2012 Macbook Pro or newer
Late 2012 iMac or newer
Mid-2011 Mac mini or newer
2013 Mac Pro or newer