B-Stock, Griffin PowerMate Bluetooth, wireless Controller for Mac, fully programmable scrub wheel/switch combination, can be used as volume/mute knob, scrub wheel, scrolling tool, compatible to Mac Laptops or Desktop Units with Bluetooth 4.0, Power Requirements: 2x AAA-Battery (included), for Mac OSX 10.8 or higher, B-Stock with full warranty, may have slight traces of use