Rugged, compact design accommodates music lovers on the go. With a seven-hour battery life and a 33 ft wireless range, it's ideal for a day on the boat, a day at the beach or a picnic in the mountains. Built-in microphone allows it to double as a wireless speakerphone. FM transmission mode, 3.5 mm aux and SD/TP memory card slot add versatility. Mounting Details: Portable; Connector/Port/Interface: 3.5 mm Aux In; Bluetooth; Micro USB; SD/TF Memory Card; Depth: 2.5"; Drivers: (2) 1.5" Drivers.