Acoustic Research Bluetooth Wireless Speaker, Black (Refurbished) Control and enjoy your music wirelessly from your smartphone or tablet with Bluetooth 2-way distinctive audio system plus enhanced bass radiator Pair two speakers together for true wireless stereo sound (sold separately) Operate with AC power adapter or with 8 AA batteries (sold separately) Pair it with a second Glendale speaker, via Bluetooth, and fill the living room or deck with true stereo performance. Protected by a durable IPX weather resistant case Featuring AC adapter and battery (8 AA - not included) power options, it's the perfect speaker for those who like their music with brawn and beauty.