Since this speaker system has been mentioned I thought I may as well forward the actual FAQ sheet on the product from the B&W web site.
http://www.bowers-wilkins.com/Wireless-Music-Systems/Wireless-Music-Systems/Z2/explore.html ********** Dane Trethowan Skype: grtdane12 Phone US (213) 438-9741 Phone U.K. 01245 79 0598 Phone Australia (03) 9005 8589 Mobile: +61400494862 faceTime +61400494862 Fax +61397437954 Twitter: @grtdane