http://www.coindesk.com/btchip-launches-multi-signature-usb-bitcoin-wallet/

SB and USB on-the-go functionality

The HW.1 can be used on standard USB ports through a Chrome app running on Windows, Mac OS X, Android or Linux. It can also be used on Android devices with USB on-the-go (OTG) functionality, including a wide range of smartphones and tablets.