Grain Audio PWS.01 Packable Encased Bluetooth Wireless Speaker System with 8 Hour Rechargeable Battery (Walnut) Bluetooth 3.0+A2DP with aptX and AAC technology Award-winning sound processing by Waves recipient of a Technical GRAMMY award 2 x 2" proprietary loudspeakers Proprietary passive radiator; Patented Bass Isolation system FSC Certified Walnut with hand-applied oil finish