Stereo Systems (N/A on 531L) | 1) Bluetooth® Music Experience, Bluetooth Receiver, AM/FM, USB, Auxiliary Input, (4) Speakers, Subwoofer 2) Auxiliary Input & Bluetooth Media Locker, Bluetooth Receiver, 3.5 mm Input for MP3 devices, (4) Speakers, Subwoofer Optional (2) 3 in. Patio Speakers |